ios - 制作一些可拖动的 UIView

Question

我想做一些可拖动的 UIView。
但是如果是下面的代码，你只能拖动你最后添加的一个 UIView。

我有这个代码。
LabelView类是UIView的子类。

ViewControlle.h

@interface ViewController : UIViewController

@property (nonatomic, strong) LabelView* labelView;

@end

ViewController.m

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    _labelView = [[LabelView alloc]initWithFrame:CGRectMake(100, 200, 200, 50)];
    [self.view addSubview:_labelView];

    UIPanGestureRecognizer* pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
    [_labelView addGestureRecognizer:pan];

    UIButton* addButton = [[UIButton alloc]initWithFrame:CGRectMake(270, 60, 40, 40)];
    [addButton addTarget:self action:@selector(newLabelView) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:addButton];
}

- (void)panAction:(UIPanGestureRecognizer *)sender
{
    CGPoint p = [sender translationInView:self.view];
    CGPoint movedPoint = CGPointMake(_labelView.center.x + p.x, _labelView.center.y + p.y);
    _labelView.center = movedPoint;
    [sender setTranslation:CGPointZero inView:self.view];
}

- (void)newLabelView
{
    _labelView = [[LabelView alloc]initWithFrame:CGRectMake(20, 60, 200, 50)];
    [self.view addSubview:_labelView];
    UIPanGestureRecognizer* pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
    [_labelView addGestureRecognizer:pan];
}

Answer 1

您应该为所有 View 应用getsture。然后改变方法。 _labelView.center = movedPoint; 到 [sender view].center = movedPoint;

 - (void)panAction:(UIPanGestureRecognizer *)sender
{
    CGPoint p = [sender translationInView:self.view];
    CGPoint movedPoint = CGPointMake(_labelView.center.x + p.x, _labelView.center.y + p.y);
    [sender view].center = movedPoint;
    [sender setTranslation:CGPointZero inView:self.view];
}