OP的评论代码如下

NSURL ubiq = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];

if (ubiq) 
{ 
    NSLog(@"iCloud access at %@",ubiq.user); // TODO: Load document... 
} 
else 
{ 
    UIAlertView alert=[[UIAlertView alloc]initWithTitle:@"No iCloud access" message:@"Please set your iCloud account in Setting-iCloud" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil,nil]; // [alert show]; NSLog(@"No iCloud access"); 
}

如果您知道如何显示iCloud帐户用户名请告诉我.我已经搜索了这个,但我找不到任何答案.