iphone - 如何在用户选择 Cell 图像时更改它？

Question

在我的自定义单元格子类中，当用户选择一个单元格时，我想更改其上的图像，这是保留的属性。没有 Nib ，一切都是有代码的。

问题:

-首先，即使没有选择任何内容，单元格仍然会出现，上面有新图像。

-其次，当我点击单元格时没有任何变化；

-(void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
UIImage *cry = [UIImage APP_CRYSTAL_SELECTED];
self.leftImage = [[[UIImageView alloc] initWithImage:cry] autorelease] ;
[self.contentView addSubview:self.leftImage];
 }

Answer 1

您没有检查它是否在您的代码示例中被选中。

-(void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    if(selected)
    {
        UIImage *cry = [UIImage APP_CRYSTAL_SELECTED];
        self.leftImage = [[[UIImageView alloc] initWithImage:cry] autorelease] ;
        [self.contentView addSubview:self.leftImage];
    }
    else
    {
        //Remove image here if it exists
    }
}