Question

我正在尝试使用单击后切换到不同图像的图像列表来创建UIScrollView。案例是模拟选择图像。

我尝试使用UIButton代替UIImage，切换图片非常容易，但是当我点击按钮时，我无法滚动它们。只有当我点击按钮时才会滚动。

我尝试使用UIImages并且很容易滚动，但点击后我无法切换图像。

我挖了一点，发现了以下帖子：Xcode: How to change Image on Touching at an Image (same Position)?

这似乎是我需要的东西，但我做错了。

我的代码：

//TouchSimpleView.h
#import <UIKit/UIKit.h>

@interface TouchSimpleView : UIImageView {
    id delegate;
}
@property (retain) id delegate;
@end

@interface NSObject (TouchSimpleView)
-(void)didTouchView:(UIView *) aView;
@end


//  TouchSimpleView.m
#import "TouchSimpleView.h"
@implementation TouchSimpleView
@synthesize delegate;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"touchesBagan");
    if(delegate != nil && [delegate respondsToSelector:@selector(didTouchView:)]) {
        [delegate didTouchView:self];
    }
    [super touchesBegan:touches withEvent:event];
}
@end

我正在使用上面那样：

//  ViewController.h
#import <UIKit/UIKit.h>
#import "TouchSimpleView.h"

@interface ViewController : UIViewController {
    TouchSimpleView *touchView;
    UIImageView *bankImageView;
}

@property (nonatomic, retain) TouchSimpleView *touchView;
@property (nonatomic, retain) UIImageView *bankImageView;
@end


//  ViewController.m
#import "ViewController.h"

@interface ViewController ()
@end

@implementation ViewController
@synthesize touchView;
@synthesize bankImageView;

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

    touchView = [[TouchSimpleView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    touchView.delegate = self;
    [self.view addSubview:touchView];

    bankImageView = [[UIImageView alloc] initWithFrame:touchView.frame];
    bankImageView.image = [UIImage imageNamed:@"1.jpg"];
    [touchView addSubview: bankImageView];
}

- (void)didTouchView:(UIView *)aView {
    NSLog(@"view touched; changing image");
}

@end

我在开始时没有提到UIScrollView，但我想让这个简单的例子工作，而不是将touchView添加到UIScrollView。

我是iOS编程的初学者。请指教。

Answer 1

确保UIImageView属性userInteractionEnabled设置为YES 默认值为NO。

Answer 2

解决方案是：

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

    touchView = [[TouchSimpleView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    touchView.delegate = self;
    touchView.userInteractionEnabled = YES;
    touchView.image = [UIImage imageNamed:@"1.jpg"];
    [self.view addSubview:touchView];
}

谢谢@Mundi

Xcode：如何在UIScrollView上单击图像

2 个答案: