ios Day 9

shouldChangeText.m

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if (textView == self.txtView) {
        NSInteger newTextLength = [textView.text length] - range.length + [text length];
        if (newTextLength > 45) {
            return NO;
        }
    }
    return YES;
}

shouldendediting.m

- (BOOL) textFieldShouldEndEditing:(UITextField *)textField {
    if (textField == self.txtFieldOne &&
        [textField.text isEqualToString:@"done"]) {
        return NO;
    }
    return YES;
}

ViewController.h

@interface ViewController : UIViewController <UITextViewDelegate, UITextFieldDelegate>

@property (weak, nonatomic) IBOutlet UITextField *txtFieldOne;
@property (weak, nonatomic) IBOutlet UITextField *txtFieldTwo;
@property (weak, nonatomic) IBOutlet UITextView *txtView;
@property (weak, nonatomic) IBOutlet UIButton *btnButton;
- (IBAction)tappedButton:(id)sender;

@end

ViewControllerDidBeginEditing.m

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    if (textField == self.txtFieldOne) {
        textField.text = @"Don't edit me!";
    }
}

ViewControllerShouldBeginEdit.m

- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField {
    if (textField == self.txtFieldTwo &&
        [textField.text isEqualToString:@"No Change"]) {
        return NO;
    }
    return YES;
}