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直接看代码吧！！！

#pragma mark 判断只能为中文的
- (BOOL) zsStringInputOnlyIsChinese:(NSString*)string
{
    NSString *regex = @"[\u4e00-\u9fa5]+";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    if ([pred eva luateWithObject:string]) {
        return YES;
    }
    return NO;
}


#pragma mark 判断只能为数字的
- (BOOL) zsStringInputOnlyIsNumber:(NSString*)string
{
    NSString *regex =@"[0-9]*";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    if ([pred eva luateWithObject:string]) {
        return YES;
    }
    return NO;
}


#pragma mark 判断只能为字母的
- (BOOL) zsStringInputOnlyIsLetter:(NSString*)string
{
    NSString *regex =@"[a-zA-Z]*";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    if ([pred eva luateWithObject:string]) {
        return YES;
    }
    return NO;
}




#pragma mark 判断只能为字母或数字的
- (BOOL) zsStringInputOnlyIsNumber:(NSString*)string
{
    NSString *regex =@"[a-zA-Z0-9]*";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    if ([pred eva luateWithObject:string]) {
        return YES;
    }
    return NO;
}