有关iPhone UIDevice UIApplication的一些常见用法

1. 判断设备的类型ipad或者iphone，可在main中定义一个宏来记录。
#define IS_IPAD ([[UIDevice currentDevice] respondsToSelector:@selector(userInterfaceIdiom)] &&[[UIDevice currentDevice] userInterfaceIdion] == UIUserInterfaceIdiomPad)

2. 调用自带应用
调用Email
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://email邮箱地址"]];

调用系统电话phone
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://88888888"]];

调用SMS
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://888588"]];

调用自带浏览器Safari
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://网址"]];

还有：itms:// 可以打开MobileStore.app
audio-player-event:// 可以打开iPod
audio-player-event://?uicmd=show-purchased-playlist 可以打开iPod播放列表
video-player-event:// 可以打开iPod中的视频

3. 禁止锁屏
UIApplication *app = [UIApplication sharedApplication];
app.idleTimerDisabled = YES;

4. 设置icon上的数字
[[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];