將UITapGestureRecognizer連接到UIView

Question

我試圖將手勢連接到UIView，因此我可以點擊該對象，但它不起作用。我究竟做錯了什麼？

Shape.h

#import <UIKit/UIKit.h> 

@interface Shape : UIView; 

- (id) initWithX: (int)xVal andY: (int)yVal; 

@end 

Shape.m

#import "Shape.h" 

@implementation Shape 

- (id) initWithX:(int)xVal andY:(int)yVal { 
    self = [super init];  
    UIView *shape = [[UIView alloc] initWithFrame:CGRectMake(xVal, yVal, 10, 10)]; 
    shape.backgroundColor = [UIColor redColor]; 
    shape.userInteractionEnabled = YES;  
    [self addSubview:shape]; 
    return self; 
} 

@end 

修改後的代碼：以下代碼是在主視圖控制器。我已經從Shape類中刪除了UITapGestureRecognizer。如果我進行了以下更改，代碼可以正常工作，但是它是「框」，可響應輕擊手勢，而不是「形狀」： [shape addGestureRecognizer：tap]; 至 [box addGestureRecognizer：tap];

- (void)handlerTap:(UITapGestureRecognizer *)recognizer { 
    //CGPoint location = [recognizer locationInView:[recognizer.view superview]]; 
    NSLog(@"Success"); 
} 
-(void)drawShapes{ 
    NSLog(@"Draw"); 
    if(!box){ 
     box = [[UIView alloc] initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight-100)]; 
     box.backgroundColor = [UIColor colorWithRed: 0.8 green: 0.8 blue: 0.0 alpha:0.2]; 
     [self.view addSubview:box]; 
    } 
    for (int i = 0; i<5; i++) { 
     int x = arc4random() % screenWidth; 
     int y = arc4random() % screenHeight; 
     Shape * shape =[[Shape alloc] initWithX:x andY:y ]; 
     [box addSubview:shape]; 
     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init]; 
     [tap setNumberOfTapsRequired:1]; 
     [tap addTarget:self action:@selector(handlerTap:)]; 
     [box addGestureRecognizer:tap];  
    } 
} 

SOLUTION：據我瞭解， 自我= [超級初始化] 需要更改爲包含一個CGRECT，該CGRECT定義*形狀放置到的視圖的邊界。 self = [super initWithFrame：CGRectMake（xVal，yVal，10，10）];

此外，*形狀需要放置在0,0以確保其正確放置在其父項。 UIView * shape = [[UIView alloc] initWithFrame：CGRectMake（0，0，10，10）];

#import "Shape.h" 

@implementation Shape 

- (id) initWithX:(int)xVal andY:(int)yVal { 
    self = [super initWithFrame:CGRectMake(xVal, yVal, 10, 10)];  
    UIView *shape = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)]; 
    shape.backgroundColor = [UIColor redColor]; 
    shape.userInteractionEnabled = YES;  
    [self addSubview:shape]; 
    return self; 
} 
@end 

Answer 1

你應該手勢識別的目標設定爲self，不看，因爲您實現在Shape類的handlerTap:方法。