IOS UIbutton的長按事件實現

UIButton *aBtn=[UIButton buttonWithType:UIButtonTypeCustom];    [aBtn setFrame:CGRectMake(40, 100, 60, 60)];    [aBtn setBackgroundImage:[UIImage imageNamed:@"111.png"] forState:UIControlStateNormal];//button點擊事件    [aBtn addTarget:self action:@selector(btnShort:) forControlEvents:UIControlEventTouchUpInside];    //button長按事件    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(btnLong:)];     longPress.minimumPressDuration = 0.8; //定義按的時間    [aBtn addGestureRecognizer:longPress];-(void)btnLong:(UILongPressGestureRecognizer *)gestureRecognizer{    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) {        NSLog(@"長按事件");        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"訊息" message:@"確定刪除該模式嗎？" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"刪除", nil];        [alert show];    }}

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