iOS tableview的一些小细节

1.点击cell后点击状态消失

[tableView deselectRowAtIndexPath:indexPath animated:YES];

2.修改自带imageview的大小。
注：这段代码要放到imageview.image赋值之后。

[cell.imageView sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:[UIImage imageNamed:@"zhanweitu"]];
CGSize itemSize = CGSizeMake(40, 40); UIGraphicsBeginImageContextWithOptions(itemSize, NO, UIScreen.mainScreen.scale);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[cell.imageView.image drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();