1.類型轉(zhuǎn)換
Error:Assigning to 'CalcAppDelegate *strong from incompatible type id nullable
app_delegate? ? ? ? = (CalcAppDelegate *)[[UIApplication sharedApplication] delegate];
2.注掉圖中腳本
1.類型轉(zhuǎn)換
Error:Assigning to 'CalcAppDelegate *strong from incompatible type id nullable
app_delegate? ? ? ? = (CalcAppDelegate *)[[UIApplication sharedApplication] delegate];
2.注掉圖中腳本