Question

我想用掩码创建UIView的子类。我尝试使用drawRect和layoutSubviews，但没有成功，在这些尝试视图没有出现。

- (void)layoutSubviews {
    [super layoutSubviews];

    UIBezierPath *path = [UIBezierPath new];
    [path moveToPoint:(CGPoint){self.frame.origin.x + 10, self.frame.origin.y}];
    [path addLineToPoint:(CGPoint){self.frame.origin.x + self.frame.size.width, self.frame.origin.y}];
    [path addLineToPoint:(CGPoint){self.frame.origin.x + self.frame.size.width, self.frame.origin.y + self.frame.size.height}];
    [path addLineToPoint:(CGPoint){self.frame.origin.x +10, self.frame.origin.y + self.frame.size.height}];
    [path addLineToPoint:(CGPoint){self.frame.origin.x +10, self.frame.origin.y + (self.frame.size.height/2) + 5}];
    [path addLineToPoint:(CGPoint){self.frame.origin.x , self.frame.origin.y + (self.frame.size.height/2)}];
    [path addLineToPoint:(CGPoint){self.frame.origin.x +10, self.frame.origin.y + (self.frame.size.height/2) - 5}];
    [path closePath];
    CAShapeLayer *mask = [CAShapeLayer new];
    mask.frame = self.bounds;
    mask.path = path.CGPath;
    self.layer.mask = mask;
}

我有什么方法可以覆盖这样做？我看到类似问题的答案，但不适合我。

Answer 1

我找到了解决方案。我在我的视图中创建了另一个视图，并将掩码应用于她。

代码：

@interface BubbleView()

@property (nonatomic, strong) UIView *maskView;

@end
@implementation BubbleView


-(id) initWithCoder:(NSCoder *)aDecoder {

    self = [super initWithCoder:aDecoder];

    self.maskView = [[UIView alloc] init];
    [self addSubview:self.maskView];
    self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.0];
    return self;
}

- (void)drawRect:(CGRect)rect {

    self.maskView.frame = self.bounds;
    self.maskView.backgroundColor = [UIColor whiteColor];

   [super drawRect:rect];
}

- (void)layoutSubviews {
    [super layoutSubviews];

    UIBezierPath *path = [UIBezierPath new];
    [path moveToPoint:(CGPoint){self.maskView.frame.origin.x + 10, self.maskView.frame.origin.y}];
    [path addLineToPoint:(CGPoint){self.maskView.frame.origin.x + self.maskView.frame.size.width, self.maskView.frame.origin.y}];
    [path addLineToPoint:(CGPoint){self.maskView.frame.origin.x + self.maskView.frame.size.width, self.maskView.frame.origin.y + self.maskView.frame.size.height}];
    [path addLineToPoint:(CGPoint){self.maskView.frame.origin.x +10, self.maskView.frame.origin.y + self.maskView.frame.size.height}];
    [path addLineToPoint:(CGPoint){self.maskView.frame.origin.x +10, self.maskView.frame.origin.y + (self.maskView.frame.size.height/2) + 5}];
    [path addLineToPoint:(CGPoint){self.maskView.frame.origin.x , self.maskView.frame.origin.y + (self.maskView.frame.size.height/2)}];
    [path addLineToPoint:(CGPoint){self.maskView.frame.origin.x +10, self.maskView.frame.origin.y + (self.maskView.frame.size.height/2) - 5}];
    [path closePath];

    CAShapeLayer *mask = [CAShapeLayer new];
    mask.frame = self.maskView.bounds;
    mask.path = path.CGPath;
    self.maskView.layer.mask = mask;

    [self layoutIfNeeded];

}

UIView子类中的CAShapeLayer

1 个答案: