UIApplication的一些属性

1. iPhone不进入锁屏待机状态：

[UIApplication sharedApplication].idleTimerDisabled = YES;

如果希望能进入待机锁屏状态，设置为NO就可以了。

2.设置icon上的数字图标：

[UIApplication sharedApplication].applicationIconBadgeNumber = 4;

在iOS8.0以后在使用这个属性之前必须先设置

[[UIApplication sharedApplication] registerUserNotificationSettings:];

3.设置摇动手势的时候，是否支持redo，undo操作

[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;

4.判断程序运行状态

if ([UIApplication sharedApplication].applicationState == UIApplicationStateActive) {

}

typedef NS_ENUM(NSInteger, UIApplicationState) {

    UIApplicationStateActive,

    UIApplicationStateInactive,

    UIApplicationStateBackground

} NS_ENUM_AVAILABLE_IOS(4_0);

5.显示联网状态

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

6.打开一个网页：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.baidu.com"]];

7.发送电子邮件

NSString *recipients =@"mailto:[email protected][email protected],[email protected]&subject=Hello from California!";

    NSString *body =@"&body=It is raining in sunny California!";

    NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body];

    email = [email stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    [[UIApplication sharedApplication]openURL:[NSURL URLWithString:email]];

8.拨打电话：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://1234567890"]];

9.发送短信:

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms://1234567890"]];