ios - CATextLayer 旋转？

Question

这应该真的有效，但不是:

CATextLayer* textLayer = [CATextLayer layer];
textLayer.string = @"text";
[textLayer setValue:[NSNumber numberWithDouble:M_PI / 2.f forKey:@"transform.rotation"];
[self addSublayer:textLayer];

事实上，当我打印 transform.rotation 的值时，它显示了正确答案。它只是不绘制旋转的 textLayer!

NSLog(@"rotation %@", [textLayer valueForKey:@"transform.rotation"]);

我做错了什么？

Answer 1

试试下面的代码:

textLayer.transform = CATransform3DMakeAffineTransform(CGAffineTransformMakeRotation(M_PI_2));

代替:

[textLayer setValue:[NSNumber numberWithDouble:M_PI / 2.f forKey:@"transform.rotation"];