Question

我有这段代码：

- (IBAction) checkIt:(id)sender{
    NSString *button = [[(UIImageView *)sender label]text];

我想获得UIImageView的标签。我究竟做错了什么？这适用于按钮...不确定我理解如何正确访问属性。

Answer 1

子类UIImageView。添加字符串成员和属性以进行访问。不是创建UIImageView的对象，而是创建类的对象。

在.h

@interface CustomImageView : UIImageView
{
    NSString *imageName;
}

@property (nonatomic, retain) NSString *imageName;

@end

in .m

@implementation CustomImageView

@synthesize imageName;

-(void) dealloc
{
    [imageName release];
    [super dealloc];
}
@end

在您要使用此类的文件中

-(void) addCustomImageView
{
    CustomImageView *imgView = [[CustomImageView alloc]initWithImage:[UIImage imageNamed:@"abc.png"]];
    imgView.frame = CGRectMake(0, 0, 100, 100);
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imgViewtapped:)];
    [imgView addGestureRecognizer:tap];
    [tap release];
    [self.view addSubview:imgView];
    [imgView release];

}

-(NSString *) imgViewtapped:(CustomImageView *)sender
{
    return [sender imageName];
}

Answer 2

UIImageViews没有标签。

https://developer.apple.com/library/ios/#documentation/uikit/reference/UIImageView_Class/Reference/Reference.html

iOS：获取图片标签

2 个答案: