iOS版 - 钥匙扣 - 密码箱，不保存第一次启动阵列

Question

I am probably doing something wrong, but when I use the code below, and want Lockbox to save elements to the keychain on the first launch of the app nothing is stored. If I then run the app again and add the elements in the else part, then it saves the data.

Any suggestions?

NSString *value = @"";
NSArray *array = [Lockbox arrayForKey:@"TestKey"];
value = [array componentsJoinedByString:@"|"];

if(value == nil)
{
    BOOL result = NO;
    NSArray *narray = [NSArray arrayWithObjects:
                       [value stringByAppendingString:@"key1"],
                       [value stringByAppendingString:@"key2"],
                       [value stringByAppendingString:@"|http://www.url.com/"],
                       [value stringByAppendingString:@"|http://www.url2.com/"],nil];
    result = [Lockbox setArray:narray forKey:@"TestKey"];
}else{
    NSArray *narray = [NSArray arrayWithObjects:
                       [value stringByAppendingString:@"key1"],
                       [value stringByAppendingString:@"key2"],
                       [value stringByAppendingString:@"|http://www.url.com/"],
                       [value stringByAppendingString:@"|http://www.url2.com/"],nil];
    result = [Lockbox setArray:narray forKey:@"TestKey"];

    NSString *keyv1 =[array objectAtIndex:0];
    NSLog(@"key value %@",keyv1);

}

Answer 1

ha! got it .. didnt see it at first:

the first time, nothin is stored in the keychain so array is NIL

value should then be [nil componentsJoinedBy...]

value is nil!

so [nil stringByAppendinString will always be nil and an EMPTY array will be saved on first run

---

on second run array is NOT nil as Lockbox reads back the empty array (so then all works)

idea, change:

NSArray *array = [Lockbox arrayForKey:@"TestKey"];
value = [array componentsJoinedByString:@"|"];

if(value==nil)
...

to

NSArray *array = [Lockbox arrayForKey:@"TestKey"];
if(array)
     value = [array componentsJoinedByString:@"|"];
else
     value = @"";

if(value.length)
...