Hi everybody I'm french so scuse me for my bad english. So my problem is when I use CADisplayLink to animate one i开发者_开发知识库mage at 60fps, it works fine but when I want to animate two image I have near 40fps. So what can I do. please help me . thank you.
The problem is not with CADisplayLink. The problem is that rendering takes to much time, and it's not possible to draw faster. You'd better optimize your drawing code (maybe reduce the image size).
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
微信重新建群怎么开发者_Go百科建？ 产品名称：苹果手机 产品型号：iPhone 11 系统版本：iOS 13
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