IOS9 KeyWindow为空的问题

建议写一个全局的宏

IOS9的[UIApplication sharedApplication].keyWindow 建议用代理的

+(UIWindow *)getKeyWindow{

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 9.0f){

return [[[UIApplication sharedApplication] delegate] window];

}else{

UIWindow *window = [UIApplication sharedApplication].keyWindow;

if (!window) {

return [[[UIApplication sharedApplication] delegate] window];

}

return window;

}

}