用kvo监听TableViewCell图片大小变化

来源：互联网发布：轻淘客插件 mac 编辑：程序博客网时间：2024/06/04 18:13

使用三方SDWebImage, 使用sd_setImageWithUrl，设置占位图片，当TableViewCell上的图片没有刷新出来的时候，保证其位置不会被占用。
eg. [cell.titltImageView sd_setImageWithURL:[NSURL URLWithString:car.newsImage] placeholderImage:[UIImage imageNamed:@”zhanwei2_1”]];
//用kvo监听
方法:重点内容
static void *imageViewFrameKey = &imageViewFrameKey;

(void)observeValueForKeyPath:(NSString )keyPath ofObject:(id)object change:(NSDictionary )change context:(void *)context;
eg:
(void)observeValueForKeyPath:(NSString )keyPath ofObject:(id)object change:(NSDictionary )change context:(void *)context
{
if (context == imageViewFrameKey) {
```
//此时监听到imageView的frame发生变化，改成自定义的frame值UIImageView *imageView = (UIImageView *)object;CGRect newRect = CGRectMake(6, 4, 82, 51);if (!CGRectEqualToRect(imageView.frame, newRect)) {    imageView.frame = newRect;}
```
} else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}重点内容

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