實現方法：

1）將輸入框的代理設置為self

（在lb文件中將輸入框的delegate設置為File’s Owner 。或者使用代碼textField.delegate = self;

2）將輸入框所對應的ViewController.h設置實現了UITextFieldDelegate協議

在ViewController.m文件中實現UITextFieldDelegate的三個方法即可：

#pragma -mark UITextField Delegate

-(void)textFieldDidBeginEditing:(UITextField *)textField{

CGRect frame = textField.frame;

int offset = frame.origin.y +32 - (self.view.frame.size.height -216.0);//鍵盤高度216

NSTimeInterval animationDuration = 0.30f;

[UIViewbeginAnimations:@"ResizeForKeyboard"context:nil];

[UIViewsetAnimationDuration:animationDuration];

//將視圖的Y坐標向上移動offset個單位，以使下面騰出地方用於軟鍵盤的顯示

if(offset > 0)

self.view.frame =CGRectMake(0.0f, -offset,self.view.frame.size.width,self.view.frame.size.height);

[UIViewcommitAnimations];

}

//當用戶按下return鍵或者按回車鍵，keyboard消失

-(BOOL)textFieldShouldReturn:(UITextField *)textField

{

[textField resignFirstResponder];

return YES;

}

//輸入框編輯完成以後，將視圖恢復到原始狀態

-(void)textFieldDidEndEditing:(UITextField *)textField

{

self.view.frame =CGRectMake(0,0, self.view.frame.size.width,self.view.frame.size.height);

}

//觸摸view隱藏鍵盤――touchDown

- (IBAction)View_TouchDown:(id)sender {

// 發送resignFirstResponder.

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

}