UIView * footView = [[UIView alloc]initWithFrame:CGRectMake(10, 40, 300, 400)];
footView.backgroundColor = [UIColor redColor];
footView.userInteractionEnabled = YES;
[footView.layer setCornerRadius:5]; //弧度大小
footView.layer.masksToBounds = YES;
footView.contentMode = UIViewContentModeScaleAspectFill;
[self.view addSubview:footView];
// 設(shè)置某個(gè)角為圓角
/*
UIRectCornerTopLeft------左上角
UIRectCornerTopRight-----右上角
UIRectCornerBottomLeft---左下角
UIRectCornerBottomRight--右下角
*/
UIView * bgView = [[UIView alloc]initWithFrame:CGRectMake(10, 40, 300, 400)];
bgView.backgroundColor = [UIColor redColor];
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bgView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(5, 5)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = bgView.bounds;
maskLayer.path = maskPath.CGPath;
bgView.layer.mask = maskLayer;
[self.view addSubview:bgView];
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