Unable to boot device because it cannot be located on disk.

 xcrun simctl erase all

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Delegate

Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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LLVM相关技术文章收集

Chris Lattner的LLVM教程中文版： https://llvm-tutorial-cn.readthedocs.io/en/latest/chapter-1.html IBM - 使用 LLVM 框架创建一个工作编译器： https://www.ibm.com/developerworks/cn/opensource/os-createcompilerllvm1/index.html https://www.ibm.com/developerworks/cn/opensource/os-createcompilerllvm2/index.html
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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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