对象方法 (位置 NSObject.h)
- (id)performSelector:(SEL)aSelector;
- (id)performSelector:(SEL)aSelector withObject:(id)object;
- (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;
对象category Runloop定时器方法 (位置 NSRunLoop.h 中的NSObject (NSDelayedPerforming))
注意 : 这是runloop定时器方法, 基于runloop, 在主线程上有一条在循环的runloop,所以在主线程可以直接执行, 但是, 但在子线程时, 无法执行, 需要获取当前子线程的runloop, 让runloop跑起来, 方法才会执行
不信可以尝试下, 在子线程中使用- (void)performSelector:(SEL)aSelector withObject:(nullable id)anArgument afterDelay:(NSTimeInterval)delay;看看会不会执行, 如果不执行, 在后面加上[[NSRunLoop currentRunLoop] run];再试试, 当然事件执行完后,记得结束掉runloop
- (void)performSelector:(SEL)aSelector withObject:(nullable id)anArgument afterDelay:(NSTimeInterval)delay inModes:(NSArray<NSRunLoopMode> *)modes;
- (void)performSelector:(SEL)aSelector withObject:(nullable id)anArgument afterDelay:(NSTimeInterval)delay;
+ (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget selector:(SEL)aSelector object:(nullable id)anArgument;
+ (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget;
对象category NSThread 方法 (位置 NSThread.h 中的NSObject (NSThreadPerformAdditions))
// 主线程
- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(nullable id)arg waitUntilDone:(BOOL)wait modes:(nullable NSArray<NSString *> *)array;
- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(nullable id)arg waitUntilDone:(BOOL)wait;
// 指定线程
- (void)performSelector:(SEL)aSelector onThread:(NSThread *)thr withObject:(nullable id)arg waitUntilDone:(BOOL)wait modes:(nullable NSArray<NSString *> *)array API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0));
- (void)performSelector:(SEL)aSelector onThread:(NSThread *)thr withObject:(nullable id)arg waitUntilDone:(BOOL)wait API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0));
// equivalent to the first method with kCFRunLoopCommonModes
// 后台运行
- (void)performSelectorInBackground:(SEL)aSelector withObject:(nullable id)arg API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0));
虽然他们都是NSObject的方法或者是分类补充方法,但实际上,是隶属于不同模块的
网友评论