冰冻三尺，非一日之寒

UIWindow// 旋转事件 --> UIApplication --> UIWindow/** *  程序启动完毕就会调用一次 */- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ 

AppReview@apple.com-应用在提交后（处于“审核中”），应用和应用内购的状态-状态更新通知——与开发者遭拒和影响审核时间相关的信息-应用遭拒通知咨询-快速审核请求------------------------------------iTSPayments@apple.com- 支付状态查询- 与苹果向开发者支付费用相关的问题- 咨询财务报表--

1/ 网页缓存 //清除cookiesNSHTTPCookie *cookie;NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];for (cookie in [storage cookies]) { [storage deleteCookie:cookie];}UIWebV

当应用程序退到后台的时候，用户没办法及时看到消息，而推送服务即使在锁屏状态下，也能将消息及时推送给用户。  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override poin

将已有项目添加到Git  git  init 初始化一个空的代码仓库.git 目录就是代码仓库目录选择SourceControl-History查看修改记录git  add.git commit  -m "添加项目"不要关闭终端

反序列化[NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];序列化[NSJSONSerialization dataWithJSONObject:arrayoptions:0 error:NULL];connectionError修改URL中的主机地址测试连接错误定义NSURL

图片水印- (void)testWater{    UIImage *bgImage = [UIImage imageNamed:@"scene"];        // 上小文 : 基于位图(bitmap) ,  所有的东西需要绘制到一张新的图片上去        // 1.创建一个基于位图的上下文(开启一个基于位图的上下文)    // size : 新图片的尺

Modal- (IBAction)jump {    // 展示MJTwoViewController    MJTwoViewController *two = [[MJTwoViewController alloc] init];        [self presentViewController:two animated:YES completion:^{

NSCoding #define MJPath [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"stu.data"]- (IBAction)save { 

手势：        UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(productClick)];        [self addGestureRecognizer:tapGesture];

屏幕截图- (IBAction)clip {    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        // 1.捕捉        UIImage *newImage = [UIImage

图片裁剪- (void)circleTest2{    // 1.加载原图    UIImage *oldImage = [UIImage imageNamed:@"me"];        // 2.开启上下文    CGFloat borderW = 2; // 圆环的宽度    CGFloat imageW = oldImage.size.width 

模仿UIImageView@interface MJImageView : UIView// 自定义的属性一定要重写setter方法,并在setter方法重绘@property (nonatomic, strong) UIImage *image;@end@implementation MJImageView-

#pragma mark - 空白处收起键盘- (void)addGestRecognizer{    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapped:)];    tap.numberOfTouchesRequired =1