UITextView 限制字數
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if ([text rangeOfString:@"\n"].length > 0) {
[textView resignFirstResponder];
return NO;
}
int maxTextCount = 200；
NSString *string = nil;
if (range.length > 0) {
if ([textView.text length] >= range.location) {
string = [textView.text substringToIndex:range.location];
}
string = [NSString stringWithFormat:@"%@%@", string, text];
if ([textView.text length] > range.location + range.length) {
string = [NSString stringWithFormat:@"%@%@", string, [textView.text substringFromIndex:range.location + range.length]];
}
} else {
string = [NSString stringWithFormat:@"%@%@", textView.text, text];
}
if (string.length > maxTextCount) {
NSRange rangeIndex = [string rangeOfComposedCharacterSequenceAtIndex:maxTextCount];
if (rangeIndex.length == 1) {//字數超限
textView.text = [string substringToIndex:maxTextCount];
}else{
NSRange rangeRange = [string rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, maxTextCount)];
textView.text = [string substringWithRange:rangeRange];
}
return NO;
}
return YES;
}