UILongPressGestureRecognizer issue with uibutton and uilabel

问题

i have 2 uibutton and 1 label and longpressgesture is bounded to these control. when longpress is taken place on any control then how to get the object on which longpress is taken place below is the code that i have written.

UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[btn addTarget:self action:@selector(wasDragged:withEvent:) forControlEvents:UIControlEventTouchDragInside];
//[self.view addSubview:btn];
btn.userInteractionEnabled = YES;

// add it
[self.view addSubview:btn];
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]
                                           initWithTarget:self 
                                           action:@selector(handleLongPress:)];
longPress.minimumPressDuration = 1.0;
[btn addGestureRecognizer:longPress];

below is function that is called on longpress

-(void)handleLongPress:(id)sender{
 }

if i printing description of sender then i get

 <UILongPressGestureRecognizer: 0x6aa4480; state = Began; view = <UIRoundedRectButton 0x6aa9570>; target= <(action=handleLongPress:, target=<ViewController 0x6a8cc60>)>>

from it how can i get the refrence of object on whcih longpress event takes place i mean how do i know whether i preessed UiLabel or Uibutton?

回答1:

Just check the UIGestureRecognizer's (the parent class) view property:

@property(nonatomic, readonly) UIView *view

The view the gesture recognizer is attached to. (read-only)

@property(nonatomic, readonly) UIView *view Discussion You attach (or add) a gesture recognizer to a UIView object using the addGestureRecognizer: method.

回答2:

-(void)handleLongPress:(UILongPressGestureRecognizer *)sender{


    if ([sender.view isKindOfClass:[UIButton class]]) {

            UIButton *myButton = (UIButton *)sender.view; // here is your sender object or Tapped button

            if (myButton.tag == 1) {

                    //sender is first Button. Because we assigned 1 as Button1 Tag when created.
            }
            else if (myButton.tag == 2){

                    //sender is second Button. Because we assigned 2 as Button2 Tag when created.
            }
    }

    if ([sender.view isKindOfClass:[UILabel class]]) {

        UILabel *myLabel = (UILabel *)sender.view; // here is your sender object or Tapped label.

    }


}

来源：https://stackoverflow.com/questions/11975022/uilongpressgesturerecognizer-issue-with-uibutton-and-uilabel

标签

iphone

ios

uibutton

gesture