YYTextAsyncLayer类中对contentsScale的设置是有问题的...

[cocos543]

• (instancetype)init { self = [super init]; static CGFloat scale; //global static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ scale = [UIScreen mainScreen].scale; }); self.contentsScale = scale; _sentinel = [_YYTextSentinel new]; _displaysAsynchronously = YES; return self; }

上面这段代码, 看似设置了scale其实是无效的, 因为等UIView创建好了之后, view.layer的contentsScale又会被自动设置为1.