uitextFiled字数输入限制

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

if (self.type == YXModifyTrueLoveInputTypeNick) {

NSLog(@"%ld",[self countTheStrLength:[textField.text stringByReplacingCharactersInRange:range withString:string]]);

NSInteger textLength = [self countTheStrLength:[textField.text stringByReplacingCharactersInRange:range withString:string]];

if (textLength > 4 && string.length > 0) {

return NO;

} else {

self.textLabel.text = [NSString stringWithFormat:@"还可以输入%d个字符",(int)MAX(4 - textLength, 0)];

}

}

return YES;

}

- ( NSInteger )countTheStrLength:( NSString *)strtemp {

NSInteger strlength = 0 ;

char * p = ( char *)[strtemp cStringUsingEncoding : NSUnicodeStringEncoding ];

for ( int i= 0 ; i<[strtemp lengthOfBytesUsingEncoding : NSUnicodeStringEncoding ] ;i++) {

if (*p) {

p++;

strlength++;

}else {

p++;

}

}

return (strlength+ 1 )/ 2 ;

}