iOS – UITEXTILD and UITEXTVIEW UITEXTINPUT protocol used to manage the selection results in crash

id textInput = nil;

 if ([ self.aTextView isFirstResponder]) {
 textInput = self.aTextView;
} else if ([self.aTextField isFirstResponder]) {
 textInput = self.aTextField;
 }

 if (textInput != nil) {
 UITextRange * selectedRange = textInput.selectedTextRange;
 // ...
 }

UITextField and UITextView both adopt the UITextInput protocol. The selectedRange property of UITextView returns NSRange, where UITextField does not have any selection properties/methods. I want to use a routine to manage the insertion in UITextField or UITextView.

So I did the following:

id textInput = nil;

 if ([self.aTextView isFirstResponder]) {
 textInput = self.aTextView;
} else if ([self.aTextField isFirstResponder]) {
 textInput = self.aTextField;
 }

 if (textInput != nil) {
 UITextRange * selectedRange = textInput.selectedTextRange;
 // ...
 }

It just crashes immediately on the selectedTextRange property “cannot The identified selector is sent to the instance”.

What am I doing wrong?

[Edit: It seems to work in iOS 5, but it crashes on the device in iOS 4. Is this a change in iOS 5? The document says that the protocol is 3.2.]

I verified in my application that both UITextView and UITextField crashed – [UITextView selectedTextRange]: iOS 4 simulator Unrecognized selector in the iOS 5 simulator, but not the iOS 5 simulator.

The answer to this question shows that the consistency with UITextInput is iOS 5: Can I select a specific block of text in a UITextField New features in ?. Therefore, the protocol itself seems to be iOS 3.2, but UITextView/Field did not use the protocol before iOS 5.