ios appstore 下载链接 评价链接 

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//http://itunes.apple.com/us/app/idxxxxxxx
NSString *str = [NSString stringWithFormat:
	@"http://itunes.apple.com/us/app/id%d",appid];

[[UIApplication sharedApplication] openURL:[NSURL urlWithString:str]];
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//跳转到评价页面
NSString *str = [NSString stringWithFormat:
	@"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id;=%d",appid];
[[UIApplication sharedApplication] openURL:[NSURL urlWithString:str]];