ios键盘遮挡UITextField问题

1、在

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

中注册keyboard变化的通知

-(void) registerKeyboardNotification {     NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];     [defaultCenter addObserver:self                       selector:@selector(keyboardWillShow:)//键盘将要出现时                           name:UIKeyboardWillShowNotification                         object:nil];     [defaultCenter addObserver:self                       selector:@selector(keyboardWillChanged:)//键盘将要变化时                           name:UIKeyboardWillChangeFrameNotification                         object:nil];     [defaultCenter addObserver:self                       selector:@selector(keyboardWillHide:)//键盘将要隐藏时                           name:UIKeyboardWillHideNotification                         object:nil]; }

keyboardWillShow方法的实现：

- (void)keyboardWillShow:(NSNotification *)notification {     UIWindow *window = [[UIApplication sharedApplication] keyWindow]; //UIKeyboardFrameEndUserInfoKey:动画结束后的键盘位置     NSValue *value = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey]; //keybordXY为私有属性，存储键盘的位置 //将[value CGRectValue].origin由[value CGRectValue].origin所在视图转换到window中，返回window中的rect     [self setKeybordXY:[window convertPoint:[value CGRectValue].origin toWindow:window]];     [self adjust]; }

adjust方法的实现：

- (void)adjust {     UIWindow *window = [[UIApplication sharedApplication] keyWindow];     CGRect rect = [[responseView superview] convertRect:[responseView frame] toView:window];     CGFloat curTy = adjustedView.transform.ty;     if ((rect.origin.y + rect.size.height - curTy) >= keybordXY.y) {         CGFloat offset = keybordXY.y - (rect.origin.y + rect.size.height - curTy + 20.f);         [UIView animateWithDuration:.2f                          animations:^(void){                              [adjustedView setTransform:CGAffineTransformMakeTranslation(0.f, offset)];                              [adjustedView layoutIfNeeded];                          }                          completion:^(BOOL finised){                          }];     } else {         [UIView animateWithDuration:.2f                          animations:^(void){                              [adjustedView setTransform:CGAffineTransformMakeTranslation(0.f, 0.f)];                              [adjustedView layoutIfNeeded];                          }                          completion:^(BOOL finised){                          }];     } }

keyboardWillChanged方法的实现：

- (void)keyboardWillChanged:(NSNotification *)notification {   }

keyboardWillHide方法的实现：

- (void)keyboardWillHide:(NSNotification *)notification {     if (adjustedView) {         [UIView animateWithDuration:.2f                          animations:^(void){                              [adjustedView setTransform:CGAffineTransformMakeTranslation(0.f, 0.f)];                          }                          completion:^(BOOL finised){}];     }     [self setResponseView:nil];     [self setAdjustedView:nil]; }

-(void) unregisterKeyboardNotification {     [[NSNotificationCenter defaultCenter] removeObserver:self]; }

2、移除通知