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苹果开发中文网站iOS拾遗——为什么必须在主线程操作UI
source link: http://www.cocoachina.com/ios/20190118/26167.html
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在开发过程中，我们或多或少会不经意在后台线程中调用了UIKit框架的内容，可能是在网络回调时直接imageView.image = anImage，也有可能是不小心在后台线程中调用了UIApplication.sharedApplication。而这个时候编译器会报出一个runtime错误，我们也会迅速的对其进行修正。
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