![【代码笔记】iOS-产生随机字符串 【代码笔记】iOS-产生随机字符串](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1)
一,代码:
![【代码笔记】iOS-产生随机字符串 【代码笔记】iOS-产生随机字符串](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. NSLog(@"---产生随机字符串---%@",[self generateTradeNO]); }
//产生随机字符串
- (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;
}
![【代码笔记】iOS-产生随机字符串 【代码笔记】iOS-产生随机字符串](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
二,输出:
2015-10-23 10:04:22.908 产生随机字符串[974:46634] ---产生随机字符串---DQA5AGLNIBD52KQ