IOS cainiao learning-UITextField and UITextView implement word limit

During iOS development, we need to limit the number of words, that is, the function that cannot be entered after several words are entered. Taking UITextFiled as an example, we only need to take the following steps to implement this function.

1. Declare the proxy in @ interface

[Plain]
@ Interface MyViewController: UIViewController <UITextFieldDelegate>

2. Set the delegate of UITextField, which can be implemented in the viewDidLoad method or in the nib file (or storyboard.
[Plain]
TextField. delegate = self;

3. Implement proxy methods.
[Plain]
-(BOOL) textField :( UITextField *) textField shouldChangeCharactersInRange :( nsange) range replacementString :( NSString *) string {
NSString * temp = [textField. text stringByReplacingCharactersInRange: range withString: string];
If (temp. length> 15 ){
TextField. text = [temp substringToIndex: 15];
Return NO;
}
Return YES;
}

For UITextView, you only need to implement this code in the textViewDidChange: proxy method of UITextView.

 

 

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