//判断当前文字字符长度的方法
-(NSUInteger) unicodeLengthOfString: (NSString *) text {
NSUInteger asciiLength = 0;
for (NSUInteger i = 0; i < text.length; i++) {
unichar uc = [text characterAtIndex: i];
asciiLength += isascii(uc) ? 1 : 2;
}
return asciiLength;
}
//代理方法
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
NSLog(@"text---->>%@",text);
NSInteger length=[self unicodeLengthOfString:text];
NSLog(@"%ld",(long)length);
if (length > 12)
{
return NO;
}
return YES;
}
这样功能就实现了，超过长度后就不能输入字符了。
