Question

我已经开始探索Dropbox API了解我希望用户能够备份数据库文件的应用程序。我遇到的问题是，在用户将应用程序与他们的帐户链接后（类似于通过Facebook登录），应用程序不会返回到前台。当我手动返回应用程序时，它仍然在备份屏幕上，但该帐户尚未链接（尽我所知）并且未调用handleOpenUrl应用程序委托方法。

有什么想法吗？或者也许有人知道一个很好的教程。示例Dropbox应用程序工作正常，我正在尽力使用它作为指导，但显然我已经搞砸了。

App Delegate：

#import "AppDelegate_iPad.h"
#import <DropboxSDK/DropboxSDK.h>
@interface AppDelegate_iPad () <DBSessionDelegate>

@end

@implementation AppDelegate_iPad

@synthesize window,viewController;


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    self.viewController = [[mainMenuViewController alloc]init];
    [window addSubview:viewController.view]; //< this is a main menu viewcontroller for my app
    [self.window makeKeyAndVisible];
    // Set these variables before launching the app
    NSString* appKey = @"XXXX";
    NSString* appSecret = @"XXX";
    NSString *root = kDBRootAppFolder; 
    NSString* errorMsg = nil;

    if ([appKey rangeOfCharacterFromSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]].location != NSNotFound) {
        errorMsg = @"Make sure you set the app key correctly in DBRouletteAppDelegate.m";
    } else if ([appSecret rangeOfCharacterFromSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]].location != NSNotFound) {
        errorMsg = @"Make sure you set the app secret correctly in DBRouletteAppDelegate.m";
    } else if ([root length] == 0) {
        errorMsg = @"Set your root to use either App Folder of full Dropbox";
    } else {
        NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"Info" ofType:@"plist"];
        NSData *plistData = [NSData dataWithContentsOfFile:plistPath];
        NSDictionary *loadedPlist = 
        [NSPropertyListSerialization 
         propertyListFromData:plistData mutabilityOption:0 format:NULL errorDescription:NULL];
        NSString *scheme = [[[[loadedPlist objectForKey:@"CFBundleURLTypes"] objectAtIndex:0] objectForKey:@"CFBundleURLSchemes"] objectAtIndex:0];
        if ([scheme isEqual:@"db-APP_KEY"]) {
            errorMsg = @"Set your URL scheme correctly in DBRoulette-Info.plist";
        }
    }

    DBSession* session = 
    [[DBSession alloc] initWithAppKey:appKey appSecret:appSecret root:root];
    session.delegate = self; // DBSessionDelegate methods allow you to handle re-authenticating
    [DBSession setSharedSession:session];
    [session release];

    if (errorMsg != nil) {
        [[[[UIAlertView alloc]
           initWithTitle:@"Error Configuring Session" message:errorMsg 
           delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]
          autorelease]
         show];
    }


    NSURL *launchURL = [launchOptions objectForKey:UIApplicationLaunchOptionsURLKey];
    NSInteger majorVersion = 
    [[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] objectAtIndex:0] integerValue];
    if (launchURL && majorVersion < 4) {
        // Pre-iOS 4.0 won't call application:handleOpenURL; this code is only needed if you support
        // iOS versions 3.2 or below
        [self application:application handleOpenURL:launchURL];
        return NO;
    }


    return YES;
}


- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url { /// this is never called
    if ([[DBSession sharedSession] handleOpenURL:url]) {
        if ([[DBSession sharedSession] isLinked]) {
            NSLog(@"App linked successfully!");
            // At this point you can start making API calls
        }
        return YES;
    }

    return NO;
}







@end

在主菜单中，用户按下了一个备份按钮，打开了以下视图控制器：

#import "BackupManagerViewController.h"
#import <DropboxSDK/DropboxSDK.h>
#import <stdlib.h>


@interface BackupManagerViewController () <DBRestClientDelegate>



//@property (nonatomic, readonly) DBRestClient* restClient;

@end

@implementation BackupManagerViewController
@synthesize itemsArray,delegate;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}



#pragma mark - View lifecycle

- (void)viewDidLoad
{

    //[super viewDidLoad];
    // Do any additional setup after loading the view from its nib.  
}


-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)orientation
{
    return (orientation != UIDeviceOrientationLandscapeLeft) &&
    (orientation != UIDeviceOrientationLandscapeRight);
}


- (IBAction)didPressLink {
    if (![[DBSession sharedSession] isLinked]) {
        [[DBSession sharedSession] link];
    } else {
        [[DBSession sharedSession] unlinkAll];
        [[[[UIAlertView alloc] 
           initWithTitle:@"Account Unlinked!" message:@"Your dropbox account has been unlinked" 
           delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]
          autorelease]
         show];

    }
}


-(DBRestClient *)restClient{
    if (restClient == nil) {
        restClient = [[DBRestClient alloc]initWithSession:[DBSession sharedSession]];
        restClient.delegate = self;
    }

    return restClient;
}

-(IBAction) closeButtonPressed {
    [delegate closeBackupManager];
}


@end

Answer 1

要检查的事项是

确保您没有两个具有相同db-APP_KEY
确保在您的应用程序委托中只实现其中一个（而不是两者）。

（a）中 - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation

（b）中 - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url

选项（b）已弃用，请在新应用程序中选择（a）
您已在网址方案中输入了正确的APP_KEY。

Answer 2

我遇到了同样的问题，但是在从模拟器中删除示例应用DBRoulette后才开始工作。我也删除了我自己的应用程序并重新启动了模拟器，但我不确定这些步骤是否必要。

Answer 3

您是否已将展示框网址架构添加到应用的info.plist中？

Answer 4

我认为这个问题与在模拟器中运行有关。我在设备上运行它，它工作正常。

链接到Dropbox - iOS后未调用handleOpenURL

4 个答案: