iOS 阴影+圆角

1.圆角

wechatBt.layer.cornerRadius = 8;
wechatBt.layer.masksToBounds = YES;//超出父视图部分不显示。

2.阴影

messageBt.layer.shadowOffset = CGSizeMake(1, 1);
messageBt.layer.shadowOpacity = 0.8;
messageBt.layer.shadowColor = [UIColor blackColor].CGColor;

3.圆角加阴影(错误)

messageBt.layer.cornerRadius = 8;
//messageBt.layer.masksToBounds = NO;//此处不可以设置YES，否则阴影效果无法实现，但是设置为NO时，圆角无法实现。
messageBt.layer.shadowOffset = CGSizeMake(1, 1);
messageBt.layer.shadowOpacity = 0.8;
messageBt.layer.shadowColor = [UIColor blackColor].CGColor;

解决方法： 创建一个view，设置阴影效果，然后将所需视图添加到view中，设置圆角效果即可。

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *shadowView = [[UIView alloc]initWithFrame:CGRectMake(60, 60, 100, 100)];
    shadowView.backgroundColor = UIColor.blueColor;
    shadowView.userInteractionEnabled = YES;
    shadowView.layer.cornerRadius = 50;
    shadowView.layer.shadowOffset = CGSizeMake(1, 5);
    shadowView.layer.shadowOpacity = 0.8;
    shadowView.layer.shadowColor = [UIColor lightGrayColor].CGColor;
    //shadowView.layer.masksToBounds = NO;
    [self.view addSubview:shadowView];
    
    UIButton *messageBt = [UIButton buttonWithType:UIButtonTypeSystem];
    [messageBt setFrame:CGRectMake(0, 0, 100, 100)];
    [messageBt setBackgroundColor:UIColor.cyanColor];
    [messageBt setTitle:@"button" forState:UIControlStateNormal];
    messageBt.layer.cornerRadius = 50;
    messageBt.layer.masksToBounds = YES;
    [shadowView addSubview: messageBt];
    
}

Demo地址：https://github.com/cxymq/ShadowAndRadius