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UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];UIView *firstResponder = [keyWindow performSelector:@selector(firstResponder)];[firstResponder resignFirstResponder];
iOS中获取当前视图的第一响应者，并取消响应
原文地址：http://www.cnblogs.com/duzj-1990/p/4462219.html
