Keyboard 遮挡 UITextField

方法一：通过View的中心位置来移动

-(BOOL)textFieldShouldReturn:(id)sender
{
    self.view.center=CGPointMake(160,207);   
    [sender resignFirstResponder];
    return YES;
}
- (BOOL)textFieldShouldBeginEditing:(id)sender
{
    UITextField *textField = (UITextField *)sender;
    if(textField.tag==1)
    {
        self.view.center =CGPointMake(self.view.center.x,100);
    }
    else if(textField.tag==2)
    {
        self.view.center =CGPointMake(self.view.center.x,90);
    }
    return YES;
}

　　方法二：通过判断键盘的位置来设置view的frame

- (void)keyboardWillShow:(NSNotification *)noti
{        
    //键盘输入的界面调整        
    //键盘的高度
    float height = 216.0;                
    CGRect frame = self.view.frame;        
    frame.size = CGSizeMake(frame.size.width, frame.size.height - height);        
    [UIView beginAnimations:@"Curl"context:nil];//动画开始          
    [UIView setAnimationDuration:0.30];           
    [UIView setAnimationDelegate:self];          
    [self.view setFrame:frame];  
    //[self.view setFrame:CGRectMake(0, -30, frame.size.width, frame.size.height)];
    [UIView commitAnimations];         
}


- (BOOL)textFieldShouldReturn:(UITextField *)textField 
{        
    // When the user presses return, take focus away from the text field so that the keyboard is dismissed.        
    NSTimeInterval animationDuration = 0.30f;        
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];        
    [UIView setAnimationDuration:animationDuration];        
    CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);        
    self.view.frame = rect;        
    [UIView commitAnimations];        
    [textField resignFirstResponder];
    return YES;        
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{        
    CGRect frame = textField.frame;
    int offset = frame.origin.y + 50 - (self.view.frame.size.height - 216.0);//键盘高度216
    NSTimeInterval animationDuration = 0.30f;                
    [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];                
    [UIView setAnimationDuration:animationDuration];
    float width = self.view.frame.size.width;                
    float height = self.view.frame.size.height;        
    if(offset > 0)
    {
        CGRect rect = CGRectMake(0.0f, -offset,width,height);                
        self.view.frame = rect;        
    }        
    [UIView commitAnimations];                
    
}

推荐使用第一种，方便快捷，并且好理解。