Question

我有一个grid view of images ...我如何在代码中进行更改，使其可以针对每张图片进行点击。

如何为每张图片回复点击事件？

- (void)viewDidLoad
{
[super viewDidLoad];


int Columns = 3;
int Rows=5;

int space = 10;
int width = (self.view.frame.size.width-(Columns)*space)/Columns;
int height = width;
int x = space;
int y = space;  
UIScrollView *Scroll=[[UIScrollView alloc]initWithFrame:CGRectMake(x, y,self.view.frame.size.width, self.view.frame.size.height) ];
[Scroll setContentSize:CGSizeMake(Columns*(space+width)+space, Rows*(space+(self.view.frame.size.height-(Columns)*space)/Columns)+space)];
Scroll.backgroundColor=[UIColor yellowColor];
Scroll.showsVerticalScrollIndicator=YES;

for(int i=1 ;i<30;i++)
{
    j++;


    NSLog(@"j= %i",j);


    label=[[UILabel alloc]initWithFrame:CGRectMake(x,y,width,height)];
    label.backgroundColor=[UIColor blueColor];

    image= [[UIImageView alloc] initWithFrame:CGRectMake(x,y,width,height)];
    image.image = [UIImage imageNamed:
                   [NSString stringWithFormat:@"image%02ds.jpg", i+1]]; 



    [Scroll addSubview:label];

    if (i%Columns == 0) {
        y += space+height;
        x = space;
    } else {
        x+=space+width;
    }
    [Scroll addSubview:image];

}
[self.view addSubview:Scroll];


}

Answer 1

也可以使用UIImage，但我更喜欢UIButton以防需要点击。由于UIImageView直接继承自UIView，因此它并不真正了解目标和选择器。

UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];   
imageButton.frame = CGRectMake(x,y,width,height
[imageButton setBackgroundImage:[UIImage imageNamed:
                   [NSString stringWithFormat:@"image%02ds.jpg", i+1]] forState:UIControlStateNormal];

  [imageButton addTarget:self action:@selector(imageButtonTapped:) forControlEvents:UIControlEventTouchUpInside];



    -(void)imageButtonTapped:(id) sender
    {
      //Do whatever you want to do on image tap.      
    }

Answer 2

我建议使用GMGridView，而不是创建自己的GridView http://www.cocoacontrols.com/controls/gmgridview

这是一个很好的控件，可以处理所有点击和所有内容 - 您只需要实现委托方法并按照示例操作。我以前用过它，效果很好;委托/数据源方法与UITableView非常相似，所以起初不会太混乱。

如果您不想包含外部课程，那么我建议您执行MSK所说的内容 -

Answer 3

您可以将UITapGestureRecognizer用于您的目的。

UITapGestureRecognizer *tapRecognizer=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageTapped:)];
imageView.tag=TAG; //Tag your imageview to identify in call back
[imageView addGestureRecognizer:tapRecognizer];
[tapRecognizer release];    //If not ARC

按如下方式编写动作回调...

-(void)imageTapped:(UITapGestureRecognizer *)tapRecognizer
{
    if ([tapRecognizer.view isKindOfClass:[UIImageView class]]) {
        if (tapRecognizer.view.tag==TAG) { //Identify image view tag
            //Your code for image tap action
        }
    }
}

网格视图图像按钮

3 个答案: