IOS 设置圆角

方法一

    self.loginBtn.layer.cornerRadius = 5;
    self.loginBtn.layer.masksToBounds = YES;

    serhead.layer.masksToBounds = YES;  
    userhead.layer.cornerRadius = 6.0;  
    userhead.layer.borderWidth = 1.0;  
    userhead.layer.borderColor = [[UIColor whiteColor] CGColor];

方法二

    [self.loginBtn setValue:@5 forKeyPath:@"layer.cornerRadius"];
    [self.loginBtn setValue:@YES forKeyPath:@"layer.masksToBounds"];

方法三