Xcode iOS 按下按钮然后向上拖动第二个按钮

Question

假设我不想给整数加 1。这只会在我按下UIButton 然后松开手指在另一个UIButton 上时完成。 拖动组合。 让IBAction 从组合中出现的最简单方法是什么？这可以通过触摸坐标完成，也可以只使用UIButtons 和IBActions。

如何使用IBActions 创建一个 2 键组合

Answer 1

对ViewDidLoad 方法中的第一个 UIButton 执行以下操作

    [button1 addTarget:self action:@selector(dragMoving:withEvent: )
              forControlEvents: UIControlEventTouchDragInside | UIControlEventTouchDragOutside];

    [button1 addTarget:self action:@selector(dragEnded:withEvent: )
              forControlEvents: UIControlEventTouchUpInside |
     UIControlEventTouchUpOutside];

在dragMoving 方法中

- (void)dragMoving:(UIControl *)c withEvent:event{

    NSSet* touches = [event allTouches];
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:[button2 superview]];


        if ( CGRectContainsPoint(button2.frame, currentPoint) ) {
            NSLog(@"over second button); 
        } 
    }

至于dragEnded方法：

- (void) dragEnded:(UIControl *)c withEvent:event{

    NSSet* touches = [event allTouches];
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:[self.button1 superview]];
        if ( CGRectContainsPoint(button2.frame, currentPoint) ) {
            NSLog(@"ended on button 2");
            //add 1 to the integer


        }
    else {
        NSLog(@"not on button 2");
    }
}

Answer 2

// 创建按钮，添加目标

UIButton *cloudButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [cloudButton setImage:[UIImage imageNamed:@"notification_add.png"] forState:UIControlStateNormal];
        [cloudButton setFrame:CGRectMake(0, 0, 30, 30)];
        [cloudButton addTarget:self action:@selector(dragBegan:withEvent: )
           forControlEvents: UIControlEventTouchDown];
        [cloudButton addTarget:self action:@selector(dragMoving:withEvent: )
           forControlEvents: UIControlEventTouchDragInside | UIControlEventTouchDragOutside];
        [cloudButton addTarget:self action:@selector(dragEnded:withEvent: )
           forControlEvents: UIControlEventTouchUpInside |
         UIControlEventTouchUpOutside];

        [self.view addSubview:cloudButton];

//事件方法

- (void) dragBegan: (UIControl *) c withEvent:ev
{
    NSLog(@"dragBegan......");
}

- (void) dragMoving: (UIControl *) c withEvent:ev
{
    NSLog(@"dragMoving..............");
}
- (void) dragEnded: (UIControl *) c withEvent:ev
{
    NSLog(@"dragEnded..............");
}

Answer 3

另一种方法是使用UITapGestureRecognizer 和UIPanGestureRecognizer 并跟踪按钮中的位置。我发现这更具可读性。 （实际上我最终使用了 UILabel，因为我不需要任何进一步的 UIButton 行为。）

Answer 4

尝试将您希望触摸的按钮实现为“Touch Down”、“Touch Up Inside”和“Touch Up Outside”按钮。

UIButtons 可以响应许多不同类型的事件 触摸取消 触地 触地重复 触摸拖动输入 触摸拖动退出 触摸内部拖动 触摸向外拖动 修饰内部 在外面修饰

您可以为每个按钮实现不同的操作代码，以便最好地控制您想要的任何内容。简单的案例只使用了我上面提到的2个。

此代码已经过测试并且有效

在您的 ViewController 头文件中（这是我的）：

@interface ViewController : UIViewController{
    IBOutlet UIButton * upButton;    // count up when finger released button
    IBOutlet UIButton * downButton;
    IBOutlet UILable * score;
    BOOL isButtonDown;
    unsigned int youCounter;
}

-(IBAction)downButtonDown:(id)sender;
-(IBAction)downButtonUpInside:(id)sender;
-(IBAction)downButtonDragOutside:(id)sender event:(UIEvent *)event;
-(IBAction)downButtonUpOutside:(id)sender event:(UIEvent *)event;

@end

在您的 .xib 中，将向下按钮（您希望成为原始手指按下的按钮）连接到上面的正确操作。

在您的 ViewController.m 文件中

-(void)viewDidLoad{
    [super viewDidLoad];

    isButtonDown = NO;
    youCounter   = 0;
}

-(IBAction)downButtonDown:(id)sender{
    isButtonDown = YES;
}

-(IBAction)downButtonUpInside:(id)sender{
    isButtonDown = NO;
}

-(IBAction)downButtonDragOutside:(id)sender event:(UIEvent *)event{
    NSArray theTouches = [[event allTouches] allObjects];

    [downButton setHighlighted:YES];

    if(YES == [upButton pointInside:[[theTouches objectAtIndex:0] locationInView:upButton] withEvent:event]){
        [upButton setHighlighted:YES];
    }else{
        [upButton setHighlighted:NO];
    }
}

-(IBAction)downButtonUpOutside:(id)sender event:(UIEvent *)event{
    if(YES == [upButton pointInside:[[theTouches objectAtIndex:0] locationInView:upButton] withEvent:event]){
        youCounter++;
        score.text = [NSString stringWithFormat:@"Score = %d", youCounter];
    }

    [downButton setHighlighted:NO];
    [upButton setHighlighted:NO];
}

Answer 5

 //Initalize a BOOL variable to know if you started the touch in the right place.
 BOOL correctStart = NO;

 //Get the location of the first touch, if its in the first button make correctStart = YES.
 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
      NSSet *allTouches = [event allTouches];
           for (UITouch *touch in allTouches) {
                if ([touch locationInView:button1.view]) {
                     correctStart = YES;
                }
           }
 }

 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
      NSSet *allTouches = [event allTouches];
           for (UITouch *touch in allTouches) {
                if (([touch locationInView:button2.view]) && (correctStart == YES)) {
                     anInteger++;
                }
           }
      correctStart = NO;
 }

我没有尝试这段代码，因为我不在我的 mac，所以你的结果可能会有所不同，但这应该会让你朝着正确的方向前进。