Question

如何在数组中获得5个随机字符串？我试过这个：

stringsArray = [[NSMutableArray alloc]init];
int string_lenght = 10;
NSString *symbols = @"ABCDEFGHIJKLMNOPQRSTUWXYZabcdefghijklmnopqrstuvwxyz";
NSMutableString *randomString = [NSMutableString stringWithCapacity:string_lenght];

for (int y = 0; y<5; y++) {
    for (int i = 0; i<string_lenght; i++) {
        [randomString appendFormat:@"%C", [symbols characterAtIndex:random()%[symbols length]]];
    }
    stringsArray = [NSMutableArray arrayWithObject:randomString];
}

但是在我运行之后，我所拥有的只是一个长长的随机字符串！

Answer 1

你几乎拥有它。我认为这应该有效，但我还没有测试过。

stringsArray = [[NSMutableArray alloc] init];
int string_length = 10;
NSString *symbols = @"ABCDEFGHIJKLMNOPQRSTUWXYZabcdefghijklmnopqrstuvwxyz";

for (int y = 0; y < 5; y++) 
{
    //Allocate a new "randomString" object each time, or you'll just add to the old one
    NSMutableString *randomString = [NSMutableString stringWithCapacity:string_length];
    for (int i = 0; i < string_length; i++) 
    { 
        char c = [symbols characterAtIndex:random() % [symbols length]];
        [randomString appendFormat:@"%c", c];
    }

    //Add the object to the array instead of replacing the entire array
    [stringsArray addObject:randomString];
}

Answer 2

每次都要设置字符串数组，更改

stringsArray = [NSMutableArray arrayWithObject:randomString];

到

[stringsArray addObject:randomString];

你应该将randomString初始化移动到for循环中，否则你会将新的随机字符附加到同一个字符串

NSMutableArray随机字符串

2 个答案: