两个app之间的跳转 判断一个app是否存在

{
    //测试
    UIButton * tenBtn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 30)];
    tenBtn.backgroundColor = [UIColor redColor];
    [bgImageView addSubview:tenBtn];
    tenBtn.enabled = YES;
    [tenBtn addTarget:self action:@selector(taoBtn:) forControlEvents:UIControlEventTouchUpInside];
}
#pragma mark -- 测试 两个app之间的跳转
- (void)taoBtn:(UIButton *)tr{
    //判断本地是否有淘宝App
    NSURL * myURL_APP_A = [NSURL URLWithString:@"taobao://"];
    if ([[UIApplication sharedApplication] canOpenURL:myURL_APP_A]) {
        NSLog(@"canOpenURL");
        [[UIApplication sharedApplication] openURL:myURL_APP_A];
    }
    else{
        NSLog(@"淘宝图标不显示");
//没有 就直接跳转到app store 进行手动下载
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://itunes.apple.com/gb/app/yi-dong-cai-bian/id391945719?mt=8"]];
        
    }

}

//找到应用描述的连接比如：http://itunes.apple.com/gb/app/yi-dong-cai-bian/id391945719?mt=8          
然后将 http:// 替换为 itms:// 或者 itms-apps://：就可以了
同事也要设置白名单