iOS開(kāi)發(fā)之UIView的指定角為圓角

在開(kāi)發(fā)中,當(dāng)一個(gè)UIView需要4個(gè)角都是圓角的時(shí)候我們可以通過(guò)CornerRadius來(lái)設(shè)置圓角.
當(dāng)我們有時(shí)候只是需要某些角為圓角的時(shí)候,可以通過(guò)下面的方法輕松添加圓角遮罩

    UIView * View = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
    
    View.center = self.view.center;
    
    View.backgroundColor = [UIColor redColor];
    
    [self.view addSubview:View];
    
    
    UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:View.bounds byRoundingCorners:UIRectCornerTopLeft cornerRadii:CGSizeMake(50,10)];
    
    CAShapeLayer *markLayer = [[CAShapeLayer alloc]init];

    markLayer.frame = View.bounds;
    
    markLayer.path = path.CGPath;
    
    View.layer.mask = markLayer;

UIRectCorner

指定需要成為圓角的角,從名字很容易就可以看出來(lái).想要多個(gè)角是圓角的話,可以使用 " | "組合起來(lái)就可以了.

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {
    UIRectCornerTopLeft     = 1 << 0,
    UIRectCornerTopRight    = 1 << 1,
    UIRectCornerBottomLeft  = 1 << 2,
    UIRectCornerBottomRight = 1 << 3,
    UIRectCornerAllCorners  = ~0UL
};