Issues using isEqualToString: iOS

Question

I'm trying to take an array that came from a plist, and use that strings to know if they already exists in the context.

But this error is happening

reason: '-[__NSCFArray isEqualToString:]: unrecognized selector sent to instance

here is the code..

- (NSArray*)loadPlist
{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"AlreadyDownloaded" ofType:@"plist"];
    NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
    NSArray *plistArray = [[NSMutableArray alloc] initWithArray:[dict allValues]];

    return plistArray;
}


-(void)writeToList:(NSArray *)text
{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"AlreadyDownloaded" ofType:@"plist"];
    NSArray *copy = [self loadPlist];
    NSMutableArray *list = [copy mutableCopy];



    [list addObjectsFromArray:text];

    NSArray *array  = [[NSArray alloc] initWithObjects:@"ObjectsIDS", nil];
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];

    for(NSString *ob in list)
    {

        [dict setValue:ob forKey:@"ObjectsIDS"];

    }
    [dict writeToFile:path atomically:YES];

}

-(bool)compareIDS:(NSString *)text
{
    NSArray *copy = [[NSArray alloc]initWithArray:[self loadPlist]];
    NSMutableArray *list = [copy mutableCopy];
    NSMutableString *st = [[NSMutableString alloc]init];


    for(NSString *ob in copy)
    {

        if([ob isEqualToString:text])
            return YES;


    }
    return NO;
}

Thank you guys!

Best Regards.

Answer 1

从崩溃日志中，我们怀疑NSString * ob是一个数组，而不是NSString，最好在对象ob的for（NSString * ob in copy）处设置一个断点。

Answer 2

Use

NSArray indexOfObject Method:

return [copy indexOfObject:text] != NSNotFound

or

for(int i = 0; i < copy.count; i++) {
     if([(NSString *) [copy objectAtIndex:i] isEqualToString:text]) return YES; 
}
return NO;