iOS 14 上的图片打开黑屏什么时候可以更新下

[yanjixiang]

Feature Description

[a289459798]

解决了吗

[fangjinfeng]

https://www.jianshu.com/p/bdecfbe3e698?utm_campaign=hugo

[fangjinfeng]

• (void)load {
  // 获取系统的对象方法
  Method displayLayerMethod = class_getInstanceMethod(self, @selector(displayLayer:));

  // 获取自己定义的对象方法
  Method displayLayerNewMethod = class_getInstanceMethod(self, @selector(displayLayerNew:));

  // 方法交换
  method_exchangeImplementations(displayLayerMethod, displayLayerNewMethod);
  }

• (void)displayLayerNew:(CALayer *)layer {

  Ivar imgIvar = class_getInstanceVariable([self class], "_curFrame");
  UIImage *img = object_getIvar(self, imgIvar);
  if (img) {
  layer.contents = (__bridge id)img.CGImage;
  } else {
  if (@available(iOS 14.0, *)) {
  [super displayLayer:layer];
  }
  }
  }