如何设置CG_CONTEXT_SHOW_BACKTRACE环境变量?
我的视图中有三个按钮。在viewDidLoad()中设置cornerRadus之后:button.layer.cornerRadius = 20我在日志中收到以下错误消息: <Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable. 问题: 如何设置CG_CONTEXT_SHOW_BACKTRACE环境变量? 或者如何解决此警告? 好吧,现在我已经从消息中得到了回溯。这对我来说没有任何意义。请帮忙... Aug 7 14:27:00 <Error>: CGContextSaveGState: invalid context 0x0. Backtrace: <-[UIStatusBarItemView updateContentsAndWidth]+33> <-[UIStatusBarItemView initWithItem:data:actions:style:]+477> <+[UIStatusBarItemView createViewForItem:withData:actions:foregroundStyle:]+134> <-[UIStatusBarLayoutManager _createViewForItem:withData:actions:]+163> <-[UIStatusBarLayoutManager _prepareEnabledItemType:withEnabledItems:withData:actions:itemAppearing:itemDisappearing:]+36 <-[UIStatusBarLayoutManager prepareEnabledItems:withData:actions:]+92> <-[UIStatusBarForegroundView _setStatusBarData:actions:animated:]+797> <-[UIStatusBarForegroundView setStatusBarData:actions:animated:]+332> <__51-[UIStatusBar …