IOS開發之為視圖繪制單(多)個圓角實例代碼

前言：

為視圖繪制圓角，圓角可以選左上角、左下角、右下角、右上角、全部圓角

//Core Raduias

UIView *actionView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:actionView.bounds byRoundingCorners:UIRectCornerTopRight | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = actionView.bounds;
maskLayer.path = maskPath.CGPath;
actionView.layer.mask = maskLayer;

UIRectCorner枚舉值如下:

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {

  UIRectCornerTopLeft   = 1 << 0,
  UIRectCornerTopRight  = 1 << 1,
  UIRectCornerBottomLeft = 1 << 2,
  UIRectCornerBottomRight = 1 << 3,
  UIRectCornerAllCorners = ~0UL
};

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