UIApplication

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIApplication : UIResponder <UIActionSheetDelegate>     本文转载至 http://blog.csdn.net/jpcfei/article/details/9000273
{

//获取UIApplication单例对象
+ (UIApplication *)sharedApplication;

//应用程序委托对象
@property(nonatomic,assign) id<UIApplicationDelegate> delegate;

- (void)beginIgnoringInteractionEvents;               // nested. set should be set during animations & transitions to ignore touch and other events
- (void)endIgnoringInteractionEvents;
- (BOOL)isIgnoringInteractionEvents;                  // returns YES if we are at least one deep in ignoring events

//IOS用一个布尔值用来控制是否取消应用程序空闲时间，既idleTimerDisabled。这个值的默认属性是'NO'。当大多数应用程序没有接收到用户输入信息的时候，
//系统会把设备设置成“休眠”状态，屏幕也会变暗。这样做是为了保存更多电量。事实上，应用程序在运行大部分的App的时候是不需要用户输入的，如果想保证屏
//幕长亮，请把这个变量设置为'YES'，来取消系统休眠的“空闲时间”。
@property(nonatomic,getter=isIdleTimerDisabled)       BOOL idleTimerDisabled;     // default is NO

- (BOOL)openURL:(NSURL*)url;
- (BOOL)canOpenURL:(NSURL *)url NS_AVAILABLE_IOS(3_0);

- (void)sendEvent:(UIEvent *)event;

//获取当前程序关键窗口
@property(nonatomic,readonly) UIWindow *keyWindow;

//获取当前程序涉及到窗口类数组
@property(nonatomic,readonly) NSArray  *windows;

- (BOOL)sendAction:(SEL)action to:(id)target from:(id)sender forEvent:(UIEvent *)event;

//状态栏显示网络标志
@property(nonatomic,getter=isNetworkActivityIndicatorVisible) BOOL networkActivityIndicatorVisible; // showing network spinning gear in status bar. default is NO

//状态栏的显示风格
@property(nonatomic) UIStatusBarStyle statusBarStyle; // default is UIStatusBarStyleDefault
- (void)setStatusBarStyle:(UIStatusBarStyle)statusBarStyle animated:(BOOL)animated;

@property(nonatomic,getter=isStatusBarHidden) BOOL statusBarHidden;
- (void)setStatusBarHidden:(BOOL)hidden withAnimation:(UIStatusBarAnimation)animation NS_AVAILABLE_IOS(3_2);

// Rotate to a specific orientation.  This only rotates the status bar and updates the statusBarOrientation property.
// This does not change automatically if the device changes orientation.
// Explicit setting of the status bar orientation is more limited in iOS 6.0 and later.

//状态栏方向
@property(nonatomic) UIInterfaceOrientation statusBarOrientation;
- (void)setStatusBarOrientation:(UIInterfaceOrientation)interfaceOrientation animated:(BOOL)animated;

// The system only calls this method if the application delegate has not
// implemented the delegate equivalent. It returns the orientations specified by
// the application's info.plist. If no supported interface orientations were
// specified it will return UIInterfaceOrientationMaskAll on an iPad and
// UIInterfaceOrientationMaskAllButUpsideDown on a phone.  The return value
// should be one of the UIInterfaceOrientationMask values which indicates the
// orientations supported by this application.
- (NSUInteger)supportedInterfaceOrientationsForWindow:(UIWindow *)window NS_AVAILABLE_IOS(6_0);

@property(nonatomic,readonly) NSTimeInterval statusBarOrientationAnimationDuration; // Returns the animation duration for the status bar during a 90 degree orientation change.  It should be doubled for a 180 degree orientation change.
@property(nonatomic,readonly) CGRect statusBarFrame; // returns CGRectZero if the status bar is hidden

@property(nonatomic) NSInteger applicationIconBadgeNumber;  // set to 0 to hide. default is 0

@property(nonatomic) BOOL applicationSupportsShakeToEdit NS_AVAILABLE_IOS(3_0);

@property(nonatomic,readonly) UIApplicationState applicationState NS_AVAILABLE_IOS(4_0);
@property(nonatomic,readonly) NSTimeInterval backgroundTimeRemaining NS_AVAILABLE_IOS(4_0);

- (UIBackgroundTaskIdentifier)beginBackgroundTaskWithExpirationHandler:(void(^)(void))handler  NS_AVAILABLE_IOS(4_0);
- (void)endBackgroundTask:(UIBackgroundTaskIdentifier)identifier NS_AVAILABLE_IOS(4_0);

- (BOOL)setKeepAliveTimeout:(NSTimeInterval)timeout handler:(void(^)(void))keepAliveHandler NS_AVAILABLE_IOS(4_0);
- (void)clearKeepAliveTimeout NS_AVAILABLE_IOS(4_0);

@property(nonatomic,readonly,getter=isProtectedDataAvailable) BOOL protectedDataAvailable NS_AVAILABLE_IOS(4_0);

@property(nonatomic,readonly) UIUserInterfaceLayoutDirection userInterfaceLayoutDirection NS_AVAILABLE_IOS(5_0);

@end