如何判断ios设备中是否安装了某款应用

URL Schemes关键字研究一下即可 常见得URL Schemes见http://www.cnblogs.com/huangzs/p/4491286.html

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"alipay://"]])

{

NSLog(@" installed");

NSURL *url = [NSURL URLWithString:@"alipay://"];

[[UIApplication sharedApplication] openURL:url];

}

else

{

//提示用户去下载

UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"提示" message:@"支付宝未安装,是否去下载最新版本的支付宝?" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"下载",nil];

alert.tag=8789;

[alert show];

}

//警报0取消1下载

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

{

if (alertView.tag==8789) {

if (buttonIndex==0) {

return;

} else  if (buttonIndex==1){

NSURL *url = [NSURL URLWithString:@"https://itunes.apple.com/cn/app/zhi-fu-bao-qian-bao-qiang/id333206289?mt=8"];

[[UIApplication sharedApplication] openURL:url];

}

}

}