Alertview: alertViewShouldEnableFirstOtherButton method can't detect subview textView - ios

Question

I create a custom alertview that subview a uitextview inside it, as shown in the screenshot.
alertview with subviewed textview
I want to disable the Submit button when the textview is empty, so I edited the alertViewShouldEnableFirstOtherButton method:
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
if ( alertView.tag == 5000 ) {
for(UIView *view in alertView.subviews) {
if([view isKindOfClass:[UITextView class]]) {
UITextView *textField = (UITextView *)view;
if ( textField.text.length == 0 ) {
return NO ;
}
return YES ;
}
}
}
else {
return YES ;
}
}
Initially, the Submit button is disable which is right, but after I edit (type something on the textview), the submit button is still disabled, it seems that the alertViewShouldEnableFirstOtherButton only call once.
So, can someone teach me how to enable the submit button after I type in something on the subviewed textview? Thanks for the great help.
##########First edit
Below is the full code about the alertview,
- (void)addRemarkAlert {
alert = [[UIAlertView alloc]
initWithTitle:[NSString stringWithFormat:#"Remarks\n\n\n\n\n\n"]
message:nil
delegate:self
cancelButtonTitle: #"Cancel"
otherButtonTitles:#"Submit", nil ];
// textView to subview in the alertview
textView_onAlertView = [[UITextView alloc]initWithFrame:CGRectMake(12, 50, 260, 100)];
textView_onAlertView.delegate = self ;
textView_onAlertView.layer.borderWidth = 2.0f;
textView_onAlertView.layer.borderColor = [[UIColor darkGrayColor] CGColor];
textView_onAlertView.layer.cornerRadius = 10.0f;
textView_onAlertView.clipsToBounds = YES ;
textView_onAlertView.autocorrectionType = UITextAutocorrectionTypeNo ;
textView_onAlertView.autocapitalizationType = UITextAutocapitalizationTypeSentences ;
textView_onAlertView.font = [UIFont fontWithName:#"HelveticaNeue-Bold" size:12];
[alert addSubview:textView_onAlertView];
alert.tag = 5000 ;
[alert show];
}
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
if ( alertView.tag == 5000 ) {
for(UIView *view in alertView.subviews)
{
if([view isKindOfClass:[UIButton class]])
{
UIButton *aButton = (UIButton *)view;
if([aButton.titleLabel.text isEqualToString:#"Submit"])
{
if ( textView_onAlertView.text.length> 0 )
{
((UIButton *) view).enabled = YES;
}
else
{
((UIButton *) view).enabled = NO;
}
}
}
}
return NO;
}
else {
return YES ;
}
}

Answer 1

- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
NSLog(#"%d",tv.text.length);
for(UIView *view in alertView.subviews)
{
if([view isKindOfClass:[UIButton class]])
{
UIButton *aButton = (UIButton *)view;
if([aButton.titleLabel.text isEqualToString:#"done"])
{
if ( tv.text.length> 0 )
{
((UIButton *) view).enabled = YES;
}
else
{
((UIButton *) view).enabled = NO;
}
}
}
}
return NO;
}
//////////////////////////////////////Entire code for your question
- (void)viewDidLoad
{
[super viewDidLoad];
[self addRemarkAlert];
}
- (void)addRemarkAlert
{
alert = [[UIAlertView alloc]
initWithTitle:[NSString stringWithFormat:#"Remarks\n\n\n\n\n\n"]
message:nil
delegate:self
cancelButtonTitle: #"Cancel"
otherButtonTitles:#"Submit", nil ];
// textView to subview in the alertview
textView_onAlertView = [[UITextView alloc]initWithFrame:CGRectMake(12, 50, 260, 100)];
textView_onAlertView.delegate = self ;
textView_onAlertView.layer.borderWidth = 2.0f;
textView_onAlertView.layer.borderColor = [[UIColor darkGrayColor] CGColor];
textView_onAlertView.layer.cornerRadius = 10.0f;
textView_onAlertView.clipsToBounds = YES ;
textView_onAlertView.autocorrectionType = UITextAutocorrectionTypeNo ;
textView_onAlertView.autocapitalizationType = UITextAutocapitalizationTypeSentences ;
textView_onAlertView.font = [UIFont fontWithName:#"HelveticaNeue-Bold" size:12];
[alert addSubview:textView_onAlertView];
alert.tag = 5000 ;
[alert show];
}
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
if ( alertView.tag == 5000 ) {
for(UIView *view in alertView.subviews)
{
if([view isKindOfClass:[UIButton class]])
{
UIButton *aButton = (UIButton *)view;
if([aButton.titleLabel.text isEqualToString:#"Submit"])
{
if ( textView_onAlertView.text.length> 0 )
{
((UIButton *) view).enabled = YES;
}
else
{
((UIButton *) view).enabled = NO;
}
}
}
}
return NO;
}
else
{
return YES ;
}
}
- (void)textViewDidChange:(UITextView *)textView
{
[self alertViewShouldEnableFirstOtherButton:alert];
}