Why does my textField disappear? - objective-c

Question

I do some practice with iPhone4S about UITextField on iOS 7.1.2.
Interface:
The interface of the first version is simple, which just has a custom UITextField named MyUITextField and a UIButtom object that use to cancel the search operation. Inside the textField, its leftView property is initially set to a UIButton object, which background image is a magnifying glass. When users tap in the textField, that magnifying glass button will be removed and the leftView property will also set to a new UIButton object, which background image is a inverted triangle. When users tap the triangle button, app will create a new view object.
Main code:
//In this version,the textField's original frame property is set to (10,40,250,30)
//and the main operations are like this:
- (void)viewDidLoad
{
[super viewDidLoad];
self.myTextField.delegate = self;
self.myTextField.leftViewMode = UITextFieldViewModeUnlessEditing;
self.myTextField.leftView = [self creCustomSearchBar];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyBoardWillAppear:)
name:#"UIKeyboardWillShowNotification"
object:nil];
[self.cancleSearchButton addTarget:self
action:#selector(cancleSearch:)
forControlEvents:UIControlEventTouchUpInside];
}
/*when tapping in the textField,keyboard will appear*/
- (void)keyBoardWillAppear:(NSNotification *)notification
{
CGRect newLeftViewIndicatorRect = CGRectMake(20,5,20,20);
UIButton *newLeftViewIndicator = [[UIButton alloc] initWithFrame:newLeftViewIndicatorRect];
NSString *imagePath = [[NSBundle mainBundle] pathForResource:#"searchbar_textfield_down_icon#2x" ofType:#"png"];
[newLeftViewIndicator setBackgroundImage:[UIImage imageWithContentsOfFile:imagePath] forState:UIControlStateNormal];
[newLeftViewIndicator addTarget:self action:#selector(createActuralLeftView:) forControlEvents:UIControlEventTouchUpInside];
self.myTextField.leftView = newLeftViewIndicator;
/*in the second verson need to call */
//[self adjustViewFrame];
[self.cancleSearchButton setTitle:#"取消" forState:UIControlStateNormal];
}
- (void)createActuralLeftView:(UIButton *)leftViewButton
{
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(tapRegionAboveKeyboard:)];
[self.view addGestureRecognizer:tapGesture];
NewLeftView *leftView = [[NewLeftView alloc] initWithFrame:CGRectMake(10, 80, 140, 100)];
leftView.delegate = self;
[self.view addSubview:leftView];
}
- (void)tapRegionAboveKeyboard:(UITapGestureRecognizer *)tapGesture
{
for (UIView *v in self.view.subviews) {
if ([v isKindOfClass:[NewLeftView class]]) {
[v removeFromSuperview];
[self.view removeGestureRecognizer:tapGesture];
return;
}
}
}
//in the second version need to call
- (void)adjustViewFrame
{
[[self.myTextField class] animateWithDuration:0.05 animations:^{
[self.myTextField setFrame:CGRectMake(self.myTextField.frame.origin.x, 40, self.myTextField.frame.size.width, self.myTextField.frame.size.height)];
}];
[[self.cancleSearchButton class] animateWithDuration:0.05 animations:^{
[self.cancleSearchButton setFrame:CGRectMake(self.cancleSearchButton.frame.origin.x, 40, self.cancleSearchButton.frame.size.width, self.cancleSearchButton.bounds.size.height)];
}];
}
In the first version things work well.
But in the second version, I set the textField frame property to (10,260,250,30), so I need to call the adjustViewFrame method in the keyBoardWillAppear: to reposition the textField in case of obscuring by the keyboard.
Here comes the problem: the textField's position is correctly moved to the right place, but when I tap the inverted triangle button, the textField disappeared.
I can't figure out what's going wrong here.