获取iOS设备的安装的app的目录、、

#include <objc/runtime.h>

Class LSApplicationWorkspace_class = objc_getClass("LSApplicationWorkspace");

NSObject* workspace = [LSApplicationWorkspace_class performSelector:@selector(defaultWorkspace)];

NSLog(@"apps: %@", [workspace performSelector:@selector(allApplications)]);

//检测设备是否安装了某个app
NSURL *instagramURL = [NSURL URLWithString:@"instagram://location?id=1"];

BOOL hasInstagram = [[UIApplication sharedApplication] canOpenURL:instagramURL];