iOS图像拉伸,stretchableImageWithLeftCapWidth 理论：http://blog.csdn.net/z251257144/article/details/7566187

常用代码整理： 12.判断邮箱格式是否正确的代码： //利用正则表达式验证 -(BOOL)isValidateEmail:(NSString *)email { NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex]; ret

stretchableImageWithLeftCapWidth resizableImageWithCapInsets