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我正在使用此代码在滚动视图中显示图像...在此按钮是在 for 循环的帮助下创建的...然后为每个按钮设置图像...现在我想选择多个图像...我想要当我点击特定按钮时，它的图像替换为“tick image”，当我再次按下它时，替换为原始图像意味着显示未选中..

for(int i=0; i<[imageArray count]; i++)
{
  if((i%4) == 0 && i!=0)
  {
      horizontal = 8.0;
      vertical = vertical + 70.0 + 8.0;
  }

  buttonImage = [UIButton buttonWithType:UIButtonTypeCustom];
  [buttonImage setFrame:CGRectMake(horizontal, vertical, 70.0, 70.0)];
  [buttonImage setTag:i];
  [buttonImage setImage:[arrayOfImages objectAtIndex:i] forState:UIControlStateNormal];
  [buttonImage addTarget:self action:@selector(buttonImagePressed:) forControlEvents:UIControlEventTouchUpInside];
  [myScrollView addSubview:buttonImage];

  horizontal = horizontal + 70.0 + 8.0;
}

我尝试了此代码以更改 (buttonImagePressed) 方法中状态更改的图像...

[buttonImage setImage:[UIImage imageNamed:@"Checkmark.png"] forState:UIControlStateSelected];

但它不起作用......它每次只更改最后一个按钮的图像，而不是特定点击的按钮......我也尝试隐藏按钮，但它再次只隐藏最后一个按钮。我在哪里做错了？？？

有没有其他方法可以改变？？？请帮我

4

2 回答 2

4

而不是 UIControlStateSelected 您应该使用 UIControlStateNormal 并保留一些布尔值来显示该按钮是否先前被选中，或者您可以根据选择将按钮的选定属性设置为 true 或 false 说：

-(void) buttonImagePressed:(UIButton*)sender
{
   UIButton *button = sender;
  if(button.selected) //already selected so now it should be deselected
  {
     [button setImage:[UIImage imageNamed:@"UnCheckmark.png"] forState:UIControlStateNormal];
      button.selected = false;
  }
   else
   { 
      [button setImage:[UIImage imageNamed:@"Checkmark.png"] forState:UIControlStateNormal];
      button.selected = true;
   }

}
于 2012-07-05T05:21:10.927 回答
1

为此，将全局标志变量作为BOOL Flag = NO;

也为每个按钮设置标签。

在方法中

-(IBAction)buttonImagePressed:(UIButton *)sender{
 if(flag==NO){
   flag=YES;
   [sender setImage:[UIImage imageNamed:@"Checkmark.png"] forState:UIControlStateNormal];
  }
 else{
 flag=NO;
 [sender setImage:[arrayOfImages objectAtIndex:sender.tag] forState:UIControlStateNormal];
 }
}
于 2012-07-05T05:28:05.737 回答