iOS在UIView遮罩層上截取一塊透明區域(新手引導頁)

用于設定新手引導頁

設定方法

- (CAShapeLayer *)addTransparencyViewWith:(UIBezierPath *)tempPath{
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:[UIScreen mainScreen].bounds];
    [path appendPath:tempPath];
    path.usesEvenOddFillRule = YES;

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = path.CGPath;
    shapeLayer.fillColor= [UIColor blackColor].CGColor;  //其他顔色都可以，隻要不是透明的
    shapeLayer.fillRule=kCAFillRuleEvenOdd;
    return shapeLayer;
}
           

使用方法:

UIBezierPath *tempPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(120, 150, 100, 50) byRoundingCorners:(UIRectCornerTopLeft |UIRectCornerTopRight |UIRectCornerBottomRight|UIRectCornerBottomLeft) cornerRadii:CGSizeMake(4, 4)];
    UIView *guideView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    guideView.backgroundColor = [UIColor blackColor];
    guideView.alpha = 0.6;
    guideView.layer.mask = [self addTransparencyViewWith:tempPath];
    [[UIApplication sharedApplication].keyWindow addSubview:guideView];