IOS——UITextField自动适应键盘弹出

    //键盘变化监听
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChange:) name:@"UIKeyboardWillChangeFrameNotification" object:nil];

- (void)keyboardChange:(NSNotification *)aNotification
{
    NSValue *value = [[aNotification userInfo] objectForKey:@"UIKeyboardFrameEndUserInfoKey"];
    float keyEnd_y = [value CGRectValue].origin.y;
    float animationDuration = [[aNotification userInfo][@"UIKeyboardAnimationDurationUserInfoKey"] floatValue];
    CGRect frame = [[UIScreen mainScreen]bounds];//屏幕尺寸
    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y = keyEnd_y - frame.size.height;
    self.view.frame = viewFrame;
    [UIView animateWithDuration:animationDuration animations:^{
    }];
}