随机加密
- (void)key {
_changeArray = @[@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"A",@"B",@"C",@"D",@"E",@"F",@"G",@"H",@"I",@"J",@"K",@"L",@"M",@"N",@"O",@"P",@"Q",@"R",@"S",@"T",@"U",@"V",@"W",@"X",@"Y",@"Z"];
NSMutableString *string = [[NSMutableString alloc]initWithCapacity:5];
_changeStr = [[NSMutableString alloc] initWithCapacity:5];
for (NSInteger i = 0; i < 4; i ++) {
NSInteger index = arc4random() % [_changeArray count] - 1;
string = [_changeArray objectAtIndex:index];
_changeStr = (NSMutableString *)[_changeStr stringByAppendingString:string];
_pictures = [NSString stringWithFormat:@"%@",_changeStr];
_pictures = _changeStr;
NSLog(@"%@",_pictures);
}
}
