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在iOS开发中,我们经常会用到延时操作,下边给大家简单介绍两种延时操作的方法。
1. - (void)performSelector:(SEL)aSelector withObject:(nullable id)anArgument afterDelay:(NSTimeInterval)delay;
[self performSelector:@selector(myMethod) withObject:nil afterDelay:1];
-(void)myMethod{
NSLog(@"1秒之后执行!");
}
在此种方法中,如果还没到执行的时间,想要取消performSelector操作,也可以,如下
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(myMethod) object:nil];
2. dispatch_after(dispatch_time_t when , dispatch_queue_t queue , dispatch_block_t block);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1*NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSLog(@"1秒之后执行!");
});