Check if iphone installs an app "Go"

Transfer from http://blog.csdn.net/zengconggen/article/details/7714514#

Development encountered a problem: when the company's multiple products, you want to be in a product a can directly open another product B. If the user has not installed product B, open the App Store download page. For this problem: there are 3 technical points:1, and whether product B has been installed for testing. 2, in-app technology to open other apps: reference: https://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ advancedapptricks/advancedapptricks.html#//APPLE_REF/DOC/UID/TP40007072-CH7-SW18

 3, the technology to jump from app to app download page: reference: http://blog.csdn.net/zengconggen/article/details/6789420for the 2nd and 3 points, this article will not speak. The 1th technical point scheme is now available: (Note: The technology is risky and may cause the app to be rejected.) But the App Store has a similar online work. See RP) Solution 1: (Proven: This scheme is IOS5 invalid, simulator can)//DeclarationBOOL apcheckifappinstalled (NSString *bundleidentifier);//Bundle identifier (eg. com.apple.mobilesafari) used to track apps//ImplementationBOOL apcheckifappinstalled (nsstring*bundleidentifier) {      StaticNSString *ConstCachefilename =@"com.apple.mobile.installation.plist"; NSString*relativecachepath = [[@"Library"stringByAppendingPathComponent:@"Caches"] Stringbyappendingpathcomponent:cachefilename]; Nsdictionary*cachedict =Nil; NSString*path =Nil; //Loop through all possible paths the cache could is in     for( Shorti =0;1; i++)      {            Switch(i) { Case 0://jailbroken apps would find the cache here; their home directory Is/var/mobilePath =[Nshomedirectory () Stringbyappendingpathcomponent:relativecachepath];  Break;  Case 1://App Store Apps and Simulator'll find the cache here, Home (/var/mobile/) is 2 directories above sandbox folder Path = [[Nshomedirectory () stringByAppendingPathComponent:@".. /.."] Stringbyappendingpathcomponent:relativecachepath];  Break;  Case 2://If The app is anywhere else, default to hardcoded/var/mobile/Path = [@"/var/mobile"Stringbyappendingpathcomponent:relativecachepath];  Break; default://Cache not found (loop not broken)        returnNO;  Break; } BOOL Isdir=NO; if([[Nsfilemanager Defaultmanager] fileexistsatpath:path isdirectory: &isdir] &&!isdir)//ensure that file existsCachedict =[Nsdictionary Dictionarywithcontentsoffile:path]; if(cachedict)//If Cache is loaded and then break the loop. If the loop is not "broken," it'll return NO later (default:case)             Break; } nsdictionary*system = [Cachedict objectforkey:@"System"];//First Check all system (jailbroken) Apps    if([System Objectforkey:bundleidentifier])returnYES; Nsdictionary*user = [Cachedict objectforkey:@"User"];//Then all the user (App store/var/mobile/applications) Apps    if([user Objectforkey:bundleidentifier])returnYES; //If Nothing returned YES already, we'll return NO now    returnNO; } Solution 2: Reference: http://blog.csdn.net/zengconggen/article/details/7714466There are limitations to this scenario: only apps that have been recently run by the user can be obtained. For apps that have been installed but are not running recently. Not applicable. BOOL Isexsit= [[UIApplication sharedapplication] Canopenurl:[nsurl urlwithstring:@"Rumtel://com.rumtel.audiomanager"]]; NSLog (@"App%@ installed", identifier); if(isexsit) {[[UIApplication sharedapplication] Openurl:[nsurl urlwithstring:@"Rumtel://com.rumtel.audiomanager?a=1&b=2#sect"]]; }  Else  {      //Open the App Store download pageScenario 3 needs to know the open address of B. Available. The final solution is identified as 3: the current public app-related information: http://Wiki.akosma.com/iphone_url_schemes

Check if iphone installs an app "Go"