小编Ste*_*Lai的帖子

我想用触摸事件来模拟橡皮擦效果,以显示顶部阻挡的图像,例如灰色;

像这样的东西:

我已经找到了很长时间的解决方案,但我做不好.

以下是我的自定义视图代码:CustomView.m:

-(id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder]) {
        [self setup];
    }
    return self;
}

-(id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;

}
-(void)setup
{
    [self setMultipleTouchEnabled:NO];
    [self setBackgroundColor:[UIColor darkGrayColor]];
    self.drawingPath = [UIBezierPath bezierPath];
    [self.drawingPath moveToPoint:CGPointZero];
    [self.drawingPath setLineWidth:5.0];

    self.image = [UIImage imageNamed:@"transformers.jpg"];
    self.shapeLayer = [CAShapeLayer layer];
    self.caLayer = [CALayer layer];
    self.caLayer.frame = self.bounds;
    self.caLayer.contents = (id)(self.image.CGImage);
    [self.layer addSublayer:self.caLayer];
}
- (void)drawRect:(CGRect)rect
{
    self.shapeLayer.path = [self.drawingPath CGPath];

    self.caLayer.mask = self.shapeLayer; …

我是Unity开发人员的首发,我在设备中保存了一个图像文件,文件路径如下所示:

string filePath = Application.persistenceDataPath + "myImage.png";

如何将其解码为字节数组以便我可以使用它？非常感谢你!