判断APP是否已安装

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NSString *str = [NSString stringWithFormat:@"%@://%@",[dic objectForKey:@"ios_url_scheme"],[dic objectForKey:@"app_bundle_id"]]; NSURL *app_url = [NSURL URLWithString:str]; BOOL hasInstalled = [[UIApplication sharedApplication] canOpenURL:app_url]; if (hasInstalled){     //说明此设备有安装app,打开APP     if (APP_Version.doubleValue <= 10) {         [[UIApplication sharedApplication] openURL:app_url];     }else{         [[UIApplication sharedApplication] openURL:app_url options:@{} completionHandler:nil];     } }else{     //说明此设备没有安装app,跳转APP_STORE     NSString *link = [dic objectForKey:@"app_link_ios"];     if (link.length != 0) {         NSString *link_pro = [link stringByReplacingOccurrencesOfString:@"https" withString:@"itms-apps"];         if (APP_Version.doubleValue <= 10) {             [[UIApplication sharedApplication] openURL:[NSURL URLWithString:link_pro]];         }else{             [[UIApplication sharedApplication] openURL:[NSURL URLWithString:link_pro] options:@{} completionHandler:nil];         }     } }