iphone - 旋转的 UIView 和核心图形的边界

Question

我有一个 UIView 的子类，它正在绘制一个位置图标。当我将视图旋转几度时，它的边界（使用绿色突出显示CGContextAddRect）似乎发生了巨大变化，导致我的绘图看起来失真。

_{（来源：bytolution.com）}

_{（来源：bytolution.com）}

这是我的代码：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.locationTagView.frame = CGRectMake(40, 80, 240, 240);
    CGAffineTransform transform = CGAffineTransformMakeRotation(DegreesToRadians(30));
    self.locationTagView.transform = transform;
    [self.view addSubview:self.locationTagView];
}

Answer 1

这修复了它：

#define LOCTAG_HEIGHT 240
#define LOCTAG_WIDTH 240

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.locationTagView.frame = CGRectMake(40, 80, LOCTAG_WIDTH, LOCTAG_HEIGHT);
    self.locationTagView.bounds = CGRectMake(0, 0, LOCTAG_WIDTH, LOCTAG_HEIGHT);
    CGAffineTransform transform = CGAffineTransformMakeRotation(DegreesToRadians(340));
    self.locationTagView.transform = transform;
    [self.view addSubview:self.locationTagView];
}

_{（来源：bytolution.com）}

单独设置边界使其工作！