CGBitmapContextCreate是线程安全的！

https://forums.developer.apple.com/thread/29031

eskimo 
  • Core Graphics is thread safe on a context-by-context basis, and you’re creating your own context to work in
  • UIImage is thread safe on modern systems (iOS 4 and later IIRC), making it 

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使__attribute__((annotate("xxx")))能作用于OC函数

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viewWillAppear不执行的解决办法

UITableViewController或UIViewController中使() 后viewWillAppear:(BOOL)animated不执行 解决方法如下： 先在 *.h 头文件里加上<UINavigationControllerDelegate> 接着在*.m 文件里加上相关代码 self.navigationController.delegate=self; 再使用此时navigationController的代理函数，就OK了。 -(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { [viewController viewWillAppear:animated]; } -(void)viewWillAppear:(BOOL)animated { NSLog(@"现在可以使用了"); } 代码实例： MyOrders.h @interface MyOrders : UIViewControllerlegate>{ } @property(nonatomic,retain)IBOutlet UITableView *table; MyOrders.m - (void)viewDidLoad { [super viewDidLoad]; self.navigationController.delegate=self; } -(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { [viewController viewWillAppear:animated]; } -(void)viewWillAppear:(BOOL)a...
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iOS中使用xpc/xpc.h

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