一，代碼： - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSLog(@" 產生隨機字元串 %@",[self g ...
一，代碼：
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSLog(@"---產生隨機字元串---%@",[self generateTradeNO]);
}
//產生隨機字元串
- (NSString *)generateTradeNO
{
static int kNumber = 15;
NSString *sourceStr = @"0123456789ABCDEFGHIJKLMNOPQRST";
NSMutableString *resultStr = [[NSMutableString alloc] init];
srand(time(0));
for (int i = 0; i < kNumber; i++)
{
unsigned index = rand() % [sourceStr length];
NSString *oneStr = [sourceStr substringWithRange:NSMakeRange(index, 1)];
[resultStr appendString:oneStr];
}
return resultStr;
}
二，輸出：
2015-10-23 10:04:22.908 產生隨機字元串[974:46634] ---產生隨機字元串---DQA5AGLNIBD52KQ
