将 UITapGestureRecognizer 连接到 UIView

Question

我正在尝试将手势连接到 UIView，以便我可以点击对象，但它不起作用。我做错了什么？

形状.h

#import <UIKit/UIKit.h>

@interface Shape : UIView; 

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

@end

形状.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

修改代码：以下代码在主 ViewController 中。我已从 Shape 类中删除了 UITapGestureRecognizer。如果我进行以下更改，该代码将起作用，但它是响应点击手势的“框”，而不是“形状”： [形状添加手势识别器：点击]； 到 [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];     
    }
}

解决方案：我了解到 self = [超级初始化]; 需要更改为包含一个 CGRECT，该 CGRECT 定义了放置 *shape 的视图的边界。 self = [super initWithFrame:CGRectMake(xVal, yVal, 10, 10)];

此外，*shape 需要放置在 0,0 以确保其正确放置在其父级中。 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

您应该将手势识别器的目标设置为self，而不是视图，因为您在Shape 类中实现了handlerTap: 方法。