// Returns a color in the same color space as the receiver with the specified alpha component.
- (UIColor *)colorWithAlphaComponent:(CGFloat)alpha;
//需要透明度的View
UIView *vagueView = [[UIView alloc] init];
[vagueView setBackgroundColor:
[[UIColor whiteColor] colorWithAlphaComponent:0.5]];
[self addSubview:vagueView];
[vagueView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(self.mas_top).offset(50);
make.centerX.mas_equalTo(self.mas_centerX).offset(0);
make.size.mas_equalTo(CGSizeMake(65, 65));
}];
[vagueView.layer setMasksToBounds:YES];
[vagueView.layer setCornerRadius:32.5];
//如果直接设置alpha 会影响到的子视图
UIButton *headBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[headBtn setImage:[ECIMAGENAME(@"user") imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forState:UIControlStateNormal];
[headBtn addTarget:self action:@selector(headerAction:) forControlEvents:UIControlEventTouchUpInside];
[vagueView addSubview:headBtn];
self.headBtn = headBtn;
[headBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.mas_equalTo(vagueView.mas_top).offset(2.5);
make.centerX.mas_equalTo(vagueView.mas_centerX).offset(0);
make.size.mas_equalTo(CGSizeMake(60, 60));
}];
[_headBtn.layer setMasksToBounds:YES];
[_headBtn.layer setCornerRadius:30];
