- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(textField == self.titleField) {
if(string.length == 0)returnYES;
NSInteger existedLength = textField.text.length;
NSInteger selectedLength = range.length;
NSInteger replaceLength = string.length;
if(existedLength - selectedLength + replaceLength > 20) {
return NO;
}
}
return YES;
}
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