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ipad小程序开发

  总结了几个月的东西终于能和大家分享了,不多说,直接看东西!

  1、禁止手机睡眠

  [UIApplication sharedApplication].idleTimerDisabled = YES;

  2、隐藏某行cell

  - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

  {

  // 如果是你需要隐藏的那一行,返回高度为0

  if(indexPath.row == YouWantToHideRow)

  return 0;

  return 44;

  }

  // 然后再你需要隐藏cell的时候调用

  [self.tableView beginUpdates];

  [self.tableView endUpdates];

  3、禁用button高亮

  button.adjustsImageWhenHighlighted = NO;

  或者在创建的时候

  UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

  4、tableview遇到这种报错failed to obtain a cell from its dataSource

是因为你的cell被调用的早了。先循环使用了cell,后又创建cell。顺序错了

可能原因:1、xib的cell没有注册 2、内存中已经有这个cell的缓存了(也就是说通过你的cellId找到的cell并不是你想要的类型),这时候需要改下cell的标识

  5、cocoa pods报这个错误:unable to access 'https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received

  解决办法:原因可能是网络问题,网络请求超时了,只需要重试就行了

  6、cocoa pods 出现ERROR: While executing gem ... (Errno::EPERM)

  解决办法:

  https://segmentfault.com/q/1010000002926243

  7、动画切换window的根控制器

  // options是动画选项

  [UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{

  BOOL oldState = [UIView areAnimationsEnabled];

  [UIView setAnimationsEnabled:NO];

  [UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController new];

  [UIView setAnimationsEnabled:oldState];

  } completion:^(BOOL finished) {

  }];

  8、去除数组中重复的对象

  NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];

  9、编译的时候遇到 no such file or directory: /users/apple/XXX

是因为编译的时候,在此路径下找不到这个文件,解决这个问题,首先是是要检查缺少的文件是不是在工程中,如果不在工程中,需要从本地拖进去,如果发现已经存在工程中了,或者拖进去还是报错,这时候需要去build phases中搜索这个文件,这时候很可能会搜出现两个相同的文件,这时候,有一个路径是正确的,删除另外一个即可。如果删除了还是不行,需要把两个都删掉,然后重新往工程里拖进这个文件即可

build phases

  10、iOS8系统中,tableView最好实现下-tableView: heightForRowAtIndexPath:这个代理方法,要不然在iOS8中可能就会出现显示不全或者无法响应事件的问题

  11、iOS8中实现侧滑功能的时候这个方法必须实现,要不然在iOS8中无法侧滑

  // 必须写的方法,和editActionsForRowAtIndexPath配对使用,里面什么不写也行

  - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

  }

  12、三个通知

NSSystemTimeZoneDidChangeNotification监听修改时间界面的两个按钮状态变化

UIApplicationSignificantTimeChangeNotification 监听用户改变时间 (只要点击自动设置按钮就会调用) NSSystemClockDidChangeNotification 监听用户修改时间(时间不同才会调用)

  13、SDWebImage本地缓存有时候会害人。如果之前缓存过一张图片,即使下次服务器换了这张图片,但是图片url没换,用sdwebimage下载下来的还是以前那张,所以遇到这种问题,不要先去怼服务器,清空下缓存再试就好了。

  14、上线前注意:

  1)、删掉代码中所有的测试代码

  2)、如果后台有审核模式,提醒后台开启此模式

  3)、主流程再跑一跑

  4)、全局搜索waring,检查所有标记waring的地方

  15、跳进app权限设置

  // 跳进app设置

  if (UIApplicationOpenSettingsURLString != NULL) {

  NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];

  [[UIApplication sharedApplication] openURL:url];

  }

  }

  16、给一个view截图

  UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);

  [view.layer renderInContext:UIGraphicsGetCurrentContext()];

  UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();

  17、开发中如果要动态修改tableView的tableHeaderView或者tableFooterView的高度,需要给tableView重新设置,而不是直接更改高度。正确的做法是重新设置一下tableView.tableFooterView = 更改过高度的view。为什么?其实在iOS8以上直接改高度是没有问题的,在iOS8中出现了contentSize不准确的问题,这是解决办法。

  18、注意对象为nil的时候,调用此对象分类的方法不会执行

  19、collectionView的内容小于其宽高的时候是不能滚动的,设置可以滚动:

  collectionView.alwaysBounceHorizontal = YES;

  collectionView.alwaysBounceVertical = YES;

  20、设置navigationBar上的title颜色和大小

  [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]

  21、颜色转图片

  + (UIImage *)cl_imageWithColor:(UIColor *)color {

  CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);

  UIGraphicsBeginImageContext(rect.size);

  CGContextRef context = UIGraphicsGetCurrentContext();

  CGContextSetFillColorWithColor(context, [color CGColor]);

  CGContextFillRect(context, rect);

  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();

  return image;

  }

  22、view设置圆角

  #define ViewBorderRadius(View, Radius, Width, Color)

  [View.layer setCornerRadius:(Radius)];

  [View.layer setMasksToBounds:YES];

  [View.layer setBorderWidth:(Width)];

  [View.layer setBorderColor:[Color CGColor]] // view圆角

  23、强/弱引用

  #define WeakSelf(type) __weak typeof(type) weak##type = type; // weak

  #define StrongSelf(type) __strong typeof(type) type = weak##type; // strong

  24、由角度转换弧度

  #define DegreesToRadian(x) (M_PI * (x) / 180.0)

  25、由弧度转换角度

  #define RadianToDegrees(radian) (radian*180.0)/(M_PI)

  26、获取图片资源

  #define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

  27、获取temp

  #define PathTemp NSTemporaryDirectory()

  28、获取沙盒 Document

  #define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]

  29、获取沙盒 Cache

  #define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

  30、GCD代码只执行一次

  #define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);

  31、自定义NSLog

  #ifdef DEBUG

  #define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)

  #else

  #define NSLog(...)

  #endif

  32、Font

  #define FontL(s) [UIFont systemFontOfSize:s weight:UIFontWeightLight]

  #define FontR(s) [UIFont systemFontOfSize:s weight:UIFontWeightRegular]

  #define FontB(s) [UIFont systemFontOfSize:s weight:UIFontWeightBold]

  #define FontT(s) [UIFont systemFontOfSize:s weight:UIFontWeightThin]

  #define Font(s) FontL(s)

  33、FORMAT

  #define FORMAT(f, ...) [NSString stringWithFormat:f, ## __VA_ARGS__]

  34、在主线程上运行

  #define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);

  35、开启异步线程

  #define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);

  36、通知

  #define NOTIF_ADD(n, f) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]

  #define NOTIF_POST(n, o) [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]

  #define NOTIF_REMV() [[NSNotificationCenter defaultCenter] removeObserver:self]

  37、随机颜色

  + (UIColor *)RandomColor {

  NSInteger aRedValue = arc4random() % 255;

  NSInteger aGreenValue = arc4random() % 255;

  NSInteger aBlueValue = arc4random() % 255;

  UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];

  return randColor;

  }

  38、获取window

  +(UIWindow*)getWindow {

  UIWindow* win = nil; //[UIApplication sharedApplication].keyWindow;

  for (id item in [UIApplication sharedApplication].windows) {

  if ([item class] == [UIWindow class]) {

  if (!((UIWindow*)item).hidden) {

  win = item;

  break;

  }

  }

  }

  return win;

  }

  39、修改textField的placeholder的字体颜色、大小

  [textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

  [textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

  40、统一收起键盘

  [[[UIApplication sharedApplication] keyWindow] endEditing:YES];

  41、控制屏幕旋转,在控制器中写

  /** 是否支持自动转屏 */

  - (BOOL)shouldAutorotate {

  return YES;

  }

  /** 支持哪些屏幕方向 */

  - (UIInterfaceOrientationMask)supportedInterfaceOrientations {

  return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;

  }

  /** 默认的屏幕方向(当前ViewController必须是通过模态出来的UIViewController(模态带导航的无效)方式展现出来的,才会调用这个方法) */

  - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

  return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;

  }

  42、获取app缓存大小

  - (CGFloat)getCachSize {

  NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];

  //获取自定义缓存大小

  //用枚举器遍历 一个文件夹的内容

  //1.获取 文件夹枚举器

  NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];

  NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];

  __block NSUInteger count = 0;

  //2.遍历

  for (NSString *fileName in enumerator) {

  NSString *path = [myCachePath stringByAppendingPathComponent:fileName];

  NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];

  count += fileDict.fileSize;//自定义所有缓存大小

  }

  // 得到是字节 转化为M

  CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;

  return totalSize;

  }

  43、清理app缓存

  - (void)handleClearView {

  //删除两部分

  //1.删除 sd 图片缓存

  //先清除内存中的图片缓存

  [[SDImageCache sharedImageCache] clearMemory];

  //清除磁盘的缓存

  [[SDImageCache sharedImageCache] clearDisk];

  //2.删除自己缓存

  NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];

  [[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];

  }

  44、模型转字典

  static NSSet *classes;

  - (NSMutableDictionary *)getParameterDictionary {

  NSMutableDictionary *dict = [NSMutableDictionary dictionary];

  Class c = self.class;

  while (c) {

  unsigned count;

  objc_property_t *properties = class_copyPropertyList([c class], &count);

  for (int i = 0; i < count; i++) {

  NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];

  dict[key] = [self valueForKey:key];

  }

  free(properties);

  // 获得父类

  c = class_getSuperclass(c);

  if ([self isClassFromFoundation:c]) break;

  }

  return dict;

  }

  - (BOOL)isClassFromFoundation:(Class)c

  {

  if (c == [NSObject class] || c == [NSManagedObject class]) return YES;

  __block BOOL result = NO;

  [[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {

  if ([c isSubclassOfClass:foundationClass]) {

  result = YES;

  *stop = YES;

  }

  }];

  return result;

  }

  - (NSSet *)foundationClasses

  {

  if (classes == nil) {

  // 集合中没有NSObject,因为几乎所有的类都是继承自NSObject,具体是不是NSObject需要特殊判断

  classes = [NSSet setWithObjects:

  [NSURL class],

  [NSDate class],

  [NSValue class],

  [NSData class],

  [NSError class],

  [NSArray class],

  [NSDictionary class],

  [NSString class],

  [NSAttributedString class], nil];

  }

  return classes;

  }

  45、交换两个方法实现

  Class aClass = [self class];

  SEL originalSelector = @selector(viewWillAppear:);

  SEL swizzledSelector = @selector(xxx_viewWillAppear:);

  Method originalMethod = class_getInstanceMethod(aClass, originalSelector);

  Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector);

  BOOL didAddMethod =

  class_addMethod(aClass,

  originalSelector,

  method_getImplementation(swizzledMethod),

  method_getTypeEncoding(swizzledMethod));

  if (didAddMethod) {

  class_replaceMethod(aClass,

  swizzledSelector,

  method_getImplementation(originalMethod),

  method_getTypeEncoding(originalMethod));

  } else {

  method_exchangeImplementations(originalMethod, swizzledMethod);

  }

  46、打印百分号和引号

  NSLog(@"%%");

  NSLog(@""");

  47、几个常用权限判断

  if ([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {

  NSLog(@"没有定位权限");

  }

  AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

  if (statusVideo == AVAuthorizationStatusDenied) {

  NSLog(@"没有摄像头权限");

  }

  //是否有麦克风权限

  AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];

  if (statusAudio == AVAuthorizationStatusDenied) {

  NSLog(@"没有录音权限");

  }

  [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {

  if (status == PHAuthorizationStatusDenied) {

  NSLog(@"没有相册权限");

  }

  }];

  48、获取手机型号

  + (NSString *)getDeviceInfo {

  struct utsname systemInfo;

  uname(&systemInfo);

  NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];

  if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";

  if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";

  if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";

  if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";

  if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";

  if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";

  if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";

  if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";

  if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";

  if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";

  if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";

  if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";

  if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";

  if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";

  if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";

  if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";

  if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";

  // 日行两款手机型号均为日本独占,可能使用索尼FeliCa支付方案而不是苹果支付

  if ([platform isEqualToString:@"iPhone9,1"]) return @"国行、日版、港行iPhone 7";

  if ([platform isEqualToString:@"iPhone9,2"]) return @"港行、国行iPhone 7 Plus";

  if ([platform isEqualToString:@"iPhone9,3"]) return @"美版、台版iPhone 7";

  if ([platform isEqualToString:@"iPhone9,4"]) return @"美版、台版iPhone 7 Plus";

  if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";

  if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";

  if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";

  if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";

  if ([platform isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";

  if ([platform isEqualToString:@"iPod5,1"]) return @"iPod Touch 5G";

  if ([platform isEqualToString:@"iPad1,1"]) return @"iPad 1G";

  if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2";

  if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2";

  if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2";

  if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2";

  if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini 1G";

  if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini 1G";

  if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini 1G";

  if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3";

  if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3";

  if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3";

  if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4";

  if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4";

  if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4";

  if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air";

  if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air";

  if ([platform isEqualToString:@"iPad4,3"]) return @"iPad Air";

  if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini 2G";

  if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini 2G";

  if ([platform isEqualToString:@"iPad4,6"]) return @"iPad Mini 2G";

  if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";

  if ([platform isEqualToString:@"x86_64"]) return @"iPhone Simulator";

  return platform;

  }

  49、长按复制功能

  - (void)viewDidLoad

  {

  [self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];

  }

  - (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {

  if (longPress.state == UIGestureRecognizerStateBegan) {

  UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];

  pasteboard.string = @"需要复制的文本";

  }

  }

  50、cocoapods升级

  在终端执行 sudo gem install -n / usr / local / bin cocoapods --pre

  51、设置启动页后,依然显示之前的

  删除app,手机重启,重新安装

  52、判断图片类型

  //通过图片Data数据第一个字节 来获取图片扩展名

  - (NSString *)contentTypeForImageData:(NSData *)data

  {

  uint8_t c;

  [data getBytes:&c length:1];

  switch (c)

  {

  case 0xFF:

  return @"jpeg";

  case 0x89:

  return @"png";

  case 0x47:

  return @"gif";

  case 0x49:

  case 0x4D:

  return @"tiff";

  case 0x52:

  if ([data length] < 12) {

  return nil;

  }

  NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];

  if ([testString hasPrefix:@"RIFF"]

  && [testString hasSuffix:@"WEBP"])

  {

  return @"webp";

  }

  return nil;

  }

  return nil;

  }

  53、获取手机和app信息

  NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

  CFShow(infoDictionary);

  // app名称

  NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];

  // app版本

  NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

  // app build版本

  NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];

  //手机序列号

  NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];

  NSLog(@"手机序列号: %@",identifierNumber);

  //手机别名: 用户定义的名称

  NSString* userPhoneName = [[UIDevice currentDevice] name];

  NSLog(@"手机别名: %@", userPhoneName);

  //设备名称

  NSString* deviceName = [[UIDevice currentDevice] systemName];

  NSLog(@"设备名称: %@",deviceName );

  //手机系统版本

  NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];

  NSLog(@"手机系统版本: %@", phoneVersion);

  //手机型号

  NSString* phoneModel = [[UIDevice currentDevice] model];

  NSLog(@"手机型号: %@",phoneModel );

  //地方型号 (国际化区域名称)

  NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];

  NSLog(@"国际化区域名称: %@",localPhoneModel );

  NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

  // 当前应用名称

  NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];

  NSLog(@"当前应用名称:%@",appCurName);

  // 当前应用软件版本 比如:1.0.1

  NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

  NSLog(@"当前应用软件版本:%@",appCurVersion);

  // 当前应用版本号码 int类型

  NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];

  NSLog(@"当前应用版本号码:%@",appCurVersionNum);

  54、获取一个类的所有属性

  id LenderClass = objc_getClass("Lender");

  unsigned int outCount, i;

  objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);

  for (i = 0; i < outCount; i++) {

  objc_property_t property = properties[i];

  fprintf(stdout, "%s %sn", property_getName(property), property_getAttributes(property));

  }

  55、image圆角

  - (UIImage *)circleImage

  {

  // NO代表透明

  UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);

  // 获得上下文

  CGContextRef ctx = UIGraphicsGetCurrentContext();

  // 添加一个圆

  CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);

  // 方形变圆形

  CGContextAddEllipseInRect(ctx, rect);

  // 裁剪

  CGContextClip(ctx);

  // 将图片画上去

  [self drawInRect:rect];

  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();

  return image;

  }

  56、image拉伸

  + (UIImage *)resizableImage:(NSString *)imageName

  {

  UIImage *image = [UIImage imageNamed:imageName];

  CGFloat imageW = image.size.width;

  CGFloat imageH = image.size.height;

  return [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];

  }

  57、JSON字符串转字典

  + (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {

  NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];

  NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];

  return responseJSON;

  }

  58、身份证号验证

  - (BOOL)validateIdentityCard {

  BOOL flag;

  if (self.length <= 0) {

  flag = NO;

  return flag;

  }

  NSString *regex2 = @"^(d{14}|d{17})(d|[xX])$";

  NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];

  return [identityCardPredicate evaluateWithObject:self];

  }

  59、获取设备mac地址

  + (NSString *)macAddress {

  int mib[6];

  size_t len;

  char *buf;

  unsigned char *ptr;

  struct if_msghdr *ifm;

  struct sockaddr_dl *sdl;

  mib[0] = CTL_NET;

  mib[1] = AF_ROUTE;

  mib[2] = 0;

  mib[3] = AF_LINK;

  mib[4] = NET_RT_IFLIST;

  if((mib[5] = if_nametoindex("en0")) == 0) {

  printf("Error: if_nametoindex errorn");

  return NULL;

  }

  if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {

  printf("Error: sysctl, take 1n");

  return NULL;

  }

  if((buf = malloc(len)) == NULL) {

  printf("Could not allocate memory. Rrror!n");

  return NULL;

  }

  if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {

  printf("Error: sysctl, take 2");

  return NULL;

  }

  ifm = (struct if_msghdr *)buf;

  sdl = (struct sockaddr_dl *)(ifm + 1);

  ptr = (unsigned char *)LLADDR(sdl);

  NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",

  *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];

  free(buf);

  return outstring;

  }

  60、导入自定义字体库

  1、找到你想用的字体的 ttf 格式,拖入工程

  2、在工程的plist中增加一行数组,“Fonts provided by application”

  3、为这个key添加一个item,value为你刚才导入的ttf文件名

  4、直接使用即可:label.font = [UIFont fontWithName:@"你刚才导入的ttf文件名" size:20.0];

  61、拿到当前正在显示的控制器,不管是push进去的,还是present进去的都能拿到

  - (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc {

  if ([vc isKindOfClass:[UINavigationController class]]) {

  return [self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]];

  }else if ([vc isKindOfClass:[UITabBarController class]]){

  return [self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]];

  } else {

  if (vc.presentedViewController) {

  return [self getVisibleViewControllerFrom:vc.presentedViewController];

  } else {

  return vc;

  }

  }

  }

  62、runtime为一个类动态添加属性

  // 动态添加属性的本质是: 让对象的某个属性与值产生关联

  objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

  63、获取runtime为一个类动态添加的属性

  objc_getAssociatedObject(self, WZBPlaceholderViewKey);

  64、KVO监听某个对象的属性

  // 添加监听者

  [self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];

  // 当监听的属性值变化的时候会来到这个方法

  - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

  if ([keyPath isEqualToString:@"property"]) {

  [self textViewTextChange];

  } else {

  }

  }

  65、Reachability判断网络状态

  NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];

  if (status == NotReachable) {

  NSLog(@"当前设备无网络");

  }

  if (status == ReachableViaWiFi) {

  NSLog(@"当前wifi网络");

  }

  if (status == NotReachable) {

  NSLog(@"当前蜂窝移动网络");

  }

  由于微信字数限制原因,放不下全文,请点击阅读原文,查看完整版文章。

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