動作要素使用UIPanGestureRecognizer可拖動視圖使視圖轉移

我想創建其中有許多動作元素可拖動視圖。爲了做到這一點，我通過Apple文檔複製了代碼，以便從here創建可拖動的視圖。動作要素使用UIPanGestureRecognizer可拖動視圖使視圖轉移

該視圖獲取平移如預期，但是當一個動作元件被點擊視圖轉移到其他位置。這裏是示例代碼和Main.storyboard的複製問題的屏幕截圖。

Main.storyboard

ViewController.h文件

#import <UIKit/UIKit.h> 

@interface ViewController : UIViewController 

- (IBAction)segmentedAction:(id)sender; 
@property (weak, nonatomic) IBOutlet UISegmentedControl *segmentOutlet; 
@property (weak, nonatomic) IBOutlet UILabel *label; 

@end

而且這是在ViewController.m代碼文件

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 
- (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
{ 
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) { 
     UIView *piece = gestureRecognizer.view; 
     CGPoint locationInView = [gestureRecognizer locationInView:piece]; 
     CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview]; 

     piece.layer.anchorPoint = CGPointMake(locationInView.x/piece.bounds.size.width, locationInView.y/piece.bounds.size.height); 
     piece.center = locationInSuperview; 
    } 
} 
- (IBAction)panPiece:(UIPanGestureRecognizer *)gestureRecognizer 
{ 
    UIView *piece = [gestureRecognizer view]; 

    [self adjustAnchorPointForGestureRecognizer:gestureRecognizer]; 

    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) { 
     CGPoint translation = [gestureRecognizer translationInView:self.view]; 

     [piece setCenter:CGPointMake([piece center].x + translation.x, [piece center].y + translation.y)]; 
     [gestureRecognizer setTranslation:CGPointZero inView:self.view]; 
    } 
} 
- (IBAction)segmentedAction:(id)sender { 
    self.label.text = [NSString stringWithFormat:@"%ld",self.segmentOutlet.selectedSegmentIndex]; 
} 
@end

任何人都可以指導我一下，我做錯了什麼這裏。

在此先感謝

來源

2015-04-08 firecast

你試圖移動一組控件上的移動手勢？平視手勢添加到哪個視圖？ – Suran

平移手勢被添加到包含分割控件和標籤的視圖中，並且是的，我想移動視圖和其中包含的所有元素 – firecast

此行爲不是因爲觸摸了操作項目，而是在您設置時發生標籤上的文字。註釋行「self.label.text = [NSString stringWithFormat：@」％ld「，self.segmentOutlet.selectedSegmentIndex];」將解決這個問題。但我不知道爲什麼會發生這種情況。 – Suran

好的，終於得到了問題。這是由於Autolayout發生的。當您嘗試設置標籤的文本時，自動佈局會強制視圖框重置爲初始值。由於您已更改了定位點，它似乎會移至某個隨機位置。

要解決該問題，簡單地使用在viewDidLoad方法以下行;

self.label.translatesAutoresizingMaskIntoConstraints = YES;

或添加以下UIView *piece = gestureRecognizer.view;以下行adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer方法： - ！

piece.translatesAutoresizingMaskIntoConstraints = YES;

乾杯:-)

來源

2015-04-09 08:50:42 Suran

動作要素使用UIPanGestureRecognizer可拖動視圖使視圖轉移

回答

相關問題