Use performSelector:withObject: afterDelay: inside UIButton action

Question

I am using the [performSelector:@selector(reloadData) withObject:nil afterDelay:0.01] inside IBAction of a UIButton, the reloadData method draw some subviews on the main view in a particular way, the issue is when I tap the button quickly and repeatedly the selector "ReloadData" executed multiple times, event though I am canceling the all previous requests to that selector, and this results in duplication for the subviews in the main view

-(IBAction) myButtonIsTapped
{
     [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(reloadData) object:nil];

    [self performSelector:@selector(reloadData) withObject:nil afterDelay:0.01];

}

and reload data method like the following:

-(void) reloadData
{
     @synchronized(self){
        // clear all subviews from the main view
        // draw new subviews
     }
}

Answer 1

What about this:

-(IBAction) myButtonIsTapped
{
    [self.myButton setUserInteractionEnabled:NO];

    [self performSelector:@selector(reloadData) withObject:nil afterDelay:0.01];

}

-(void) reloadData
{
    // Long task...
    // Enable the button again:
    [self.myButton setUserInteractionEnabled:YES];

}

Sometimes is just easier to control what the user is doing (UI), than logically dealing with what he has done.

Answer 2

做一个Thing创建一个BOOL variable并在viewdidload设置yes并检查函数是否为yes然后是方法调用，并且在buttonmake方法中也没有。