请求网络图片
UIButton * btn = [[UIButton alloc]init];
[btn setImageWithURL:[NSString stringWithFormat:@"http:xxx.png"]];
此时出现的问题是：-[_NSString absoluteURL]
[btn setImageWithURL:[USURL URLWithString:[NSString stringWIthFormat:@"hhtp:xxx.png"]]];
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