// 生成 "0000-9999" 4位驗證碼 int num = (arc4random() % 10000); randomNumber = [NSString stringWithFormat:@"%.4d", num]; NSLog(@"%@", randomNumber);// 生成 "000000-999999" 6位驗證碼 int num = (arc4random() % 1000000); randomNumber = [NSString stringWithFormat:@"%.6d", num]; NSLog(@"%@", randomNumber);
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