IOS單擊背景推出鍵盤

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1. 手勢（觸背景）關閉鍵盤

在ViewDidLoad中調用

-(void)tapBackground //在ViewDidLoad中調用{    UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOnce)];//定義一個手勢    [tap setNumberOfTouchesRequired:1];//觸擊次數這裡設為1    [self.view addGestureRecognizer:tap];//添加手勢到View中}-(void)tapOnce//手勢方法{
   [self.view endEditing:YES];
}

2. 直接關閉

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    [self.view endEditing:YES];}