大家好，又见面了，我是全栈君。
//延时的方法
//1:GCD延时 此方式在能够在參数中选择运行的线程。
是一种非堵塞的运行方式，没有找到取消运行的方法。
double delay1=2.0;//设置延时时间
dispatch_time_t popTime=dispatch_time(DISPATCH_TIME_NOW, delay1 * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^{
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@”” message:@”GCD延时” delegate:self cancelButtonTitle:@”确定” otherButtonTitles:@”取消”, nil];
;
});
//2:NSTimer延时,此方式要求必须在主线程中运行。否则无效。是一种非堵塞的运行方式，能够通过NSTimer类的- (void)invalidate;取消运行。
[NSTimer scheduledTimerWithTimeInterval:8.0f target:self selector:@selector(delayMethod2) userInfo:nil repeats:NO];
//3:PerformSelector延时
[self performSelector:@selector(delayMethod) withObject:nil afterDelay:5.0f];
//4:NSThread 延时
[NSThread sleepForTimeInterval:11.0f];
[self delayMethod3];
}
– (void)delayMethod{
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@”” message:@”PerformSelector延时” delegate:self cancelButtonTitle:@”确定” otherButtonTitles:@”取消”, nil];
;
}
– (void)delayMethod2{
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@”” message:@”NSTimer延时” delegate:self cancelButtonTitle:@”确定” otherButtonTitles:@”取消”, nil];
;
}
– (void)delayMethod3{
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@”” message:@”NSThread延时” delegate:self cancelButtonTitle:@”确定” otherButtonTitles:@”取消”, nil];
;
}
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/115864.html原文链接：https://javaforall.net
![js向数组指定位置添加元素[通俗易懂]](https://javaforall.net/wp-content/uploads/2020/11/2020110817443450-480x300.jpg)
