我一直在尋找幾個小時......不用說，我在編程方面頗爲新穎。我的目標是以編程方式顯示子視圖，並通過點擊它將其刪除。添加一個UITapGestureRecognizer到子視圖

已開始工作：顯示子視圖並通過點擊視圖（代碼如下）將其刪除。

不工作 - 無論我嘗試：通過專門在子視圖上單擊刪除子視圖。

感謝您的幫助！

我的.h文件：

#import <UIKit/UIKit.h> 

@interface ViewController : UIViewController { 

UIImageView *canvas; 
UIImageView *square; 

} 

@property (nonatomic, strong) UIImageView *canvas; 
@property (nonatomic, strong) UIImageView *square; 
@property (nonatomic) NSUInteger numberOfTouchesRequired; 

- (void)handleSingleTap: (UITapGestureRecognizer *)singleTapGestureRecognizer; 


@end

我的.m文件：

#import "ViewController.h" 

@interface ViewController() 

@end 

@implementation ViewController 

@synthesize canvas; 
@synthesize square; 


- (void)handleSingleTap: (UITapGestureRecognizer *)singleTapGestureRecognizer { 

    NSLog(@"tapGesture"); 

    [square removeFromSuperview]; 

} 

- (void)loadView { 

    canvas = [[UIImageView alloc] initWithFrame: [[UIScreen mainScreen] applicationFrame]]; 

    [canvas setImage:[UIImage imageNamed:@"canvas.png"]]; 

    self.view = canvas; 

    square = [[UIImageView alloc] initWithFrame:CGRectMake(170, 320, 40, 40)]; 

    [square setImage:[UIImage imageNamed:@"square.png"]]; 

    [self.view setUserInteractionEnabled:YES]; 

    [canvas addSubview:square]; 

    NSLog(@"square"); 

} 

- (void)viewDidLoad { 

    [super viewDidLoad]; 

    UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)]; 

    NSLog(@"initialize"); 

    singleTapGestureRecognizer.numberOfTapsRequired = 1; 

    NSLog(@"number of taps"); 

    [self.view addGestureRecognizer:singleTapGestureRecognizer]; 

    NSLog(@"square gestureRecognizer"); 

} 


- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 


@end

來源

2014-12-07 George

好..對我來說最簡單的就是在這個子視圖放的UIButton（與相同尺寸的子視圖大小），並調用這個按鈕的IBAction爲刪除動作......我恨雙擊手勢... – 2014-12-07 14:28:35

如果你想完全刪除子視圖，當你對這種觀點挖掘，那麼你就需要在該視圖中添加輕拍手勢

[square addGestureRecognizer:singleTapGestureRecognizer];

而不是

[self.view addGestureRecognizer:singleTapGestureRecognizer];

編輯

而且您需要將用戶設備互動啓用設置爲UIImage的YES，因爲UIImage's setUserInteractionEnabled默認爲NO。

[square setUserInteractionEnabled:YES];

來源

2014-12-07 14:15:19

試過這個，但它不起作用。有任何想法嗎？ – George 2014-12-07 14:27:08

@George See編輯答案。 – 2014-12-07 14:31:01

@George無論如何，Yogesh和user623396絕對是對的。點按手勢需要添加到廣場而不是整個視圖。 – 2014-12-07 15:21:09

而不是

[self.view addGestureRecognizer:singleTapGestureRecognizer];

你應該說

[square addGestureRecognizer:singleTapGestureRecognizer];

來源

2014-12-07 14:12:33 user623396

請參見下面的評論，請。 – George 2014-12-07 14:28:49

添加一個UITapGestureRecognizer到子視圖

回答

編輯

相關問題