[Code Note] iOS-generates random strings and notes ios-strings

[Code Note] iOS-generates random strings and notes ios-strings

I. Code:

-(Void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSLog (@ "--- generate random string --- % @", [self generateTradeNO]);} // generate random string-(NSString *) generateTradeNO {static int kNumber = 15; NSString * sourceStr = @ "0123456789 ABCDEFGHIJKLMNOPQRST"; 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 ;}

 

Ii. Output:

10:04:22. 908 generate a random string [974: 46634] --- generate a random string --- DQA5AGLNIBD52KQ