Web2 jun. 2024 · 有趣的是,编译器不会抱怨静态声明的选择器:好的。. 1. [ _controller performSelector: @selector ( someMethod)]; 这是因为编译器实际上能够在编译期间记录关于选择器和对象的所有信息。. 它不需要对任何事情做任何假设。. (一年前我通过查看资料来源查看了这一点,但 ... WebperformSelector响应Objective-C动态性,将方法的绑定延迟到运行时,因此编译阶段不会检测方法有效性,即方法不存在也不会提示报错。反之因为此特性,performSelector也广 …
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Web- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { /*this will pause main thread for x interval seconds. put on the top of application:didFinishLaunchingWithOptions, so it will not proceed to show window until sleep interval is finished.*/ [NSThread … Web17 jul. 2024 · 在方法- (void)performSelector:(SEL)aSelector onThread:(NSThread *)thr withObject:(nullable id)arg waitUntilDone:(BOOL)wait中, 执行方法的时候,是把输入源 … flobots concert
iOS: performSelectorOnMainThread waitUntilDone 参数详解
Web18 mei 2014 · 5 Answers. Sorted by: 194. Basically performSelector allows you to dynamically determine which selector to call a selector on the given object. In other words the selector need not be determined before runtime. Thus even though these are equivalent: [anObject aMethod]; [anObject performSelector:@selector (aMethod)]; Web9 apr. 2024 · The simplest way is as follows: If you have method. - (void)doSomething: (BOOL)flag. and want to performSelecor with flag=NO use. [object … Web23 jan. 2024 · 1. performSelector performSelector: withObject:是在iOS中的一种方法调用方式。 向一个对象传递任何消息,而不需要在编译的时候声明这些方法。 是runtime的一种应用方式。 使用performSelector一定是在运行时候才能发现,如果此方法不存在就会崩溃。 通常使用performSelector的时候与- (BOOL)respondsToSelector: (SEL)aSelector;方法 … great lakes pain and injury southfield mi