iphone iCloud app crashes when compiling on iOS 4

Question

I\'d like to use an iCloud, but when I compile the app on iOS 4.3 Simulator it crashes.

dyld: Symbol not found: _OBJC_CLASS_$_NSMetadataQuery

What should I do to

Answer 1

my sulotion is:

Where have NSMetadataQuery change to id: ex

normal : - (void)loadData:(NSMetadataQuery *)query; change to: - (void)loadData:(id)query;

normal: @property (retain, nonatomic) NSMetadataQuery *query; change to: @property (retain, nonatomic) id query;

and check iCloud available:

if ([[NSFileManager defaultManager] respondsToSelector:@selector(URLForUbiquityContainerIdentifier:)]) {
        NSURL *ubiq = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
        if (ubiq) {
            // Code for access iCloud here
        }
    }

When use NSMetadataQuery:

id _query = [[NSClassFromString(@"NSMetadataQuery") alloc] init];
// Some code here
[_query startQuery];

Have fun (^_^)