iOS开发之runtime的运用-获取当前网络状态

2014-04-03  skylonely  + 关注献花(0)

　　以前写过runtime的一些东西，此次经过runtime获取一些苹果官方不想让你拿到的东西，好比，状态栏内部的控件属性。本文将经过runtime带你一步步拿到状态栏中显示网络状态的控件，而后经过监测该控件的属性来获取当前精确网络状态，好比2G/3G/4G/WIFI。首先，咱们须要拿到状态栏，而后经过runtime去探讨状态栏内部的组成结构。

一、导入运行时头文件#import <objc/message.h>

二、编写运行时代码，获取到当前应用程序的全部成员变量复制代码1 #import "ViewController.h"2 #import <objc/message.h>34 @interface ViewController ()56 @end78 @implementation ViewController910 - (void)viewDidAppear:(BOOL)animated11 {12     // 状态栏是由当前app控制的，首先获取当前app13     UIApplication *app = [UIApplication sharedApplication];1415     // 遍历当前app的全部属性，找到关于状态栏的16     unsigned int outCount = 0;1718     Ivar *ivars = class_copyIvarList(app.class, &outCount);1920     for (int i = 0; i < outCount; i++) {21         Ivar ivar = ivars[i];22         printf("|%s", ivar_getName(ivar));23     }24 }2526 @end复制代码直接运行，能够看到打印结果为：

|_delegate|_exclusiveTouchWindows|_event|_touchesEvent|_motionEvent|_remoteControlEvent|_remoteControlEventObservers|_topLevelNibObjects|_networkResourcesCurrentlyLoadingCount|_hideNetworkActivityIndicatorTimer|_editAlertView|_statusBar|_statusBarRequestedStyle|_statusBarWindow|_observerBlocks|_postCommitActions|_mainStoryboardName|_tintViewDurationStack|_statusBarTintColorLockingControllers|_statusBarTintColorLockingCount|_preferredContentSizeCategory|_applicationFlags|_defaultTopNavBarTintColor|_undoButtonIndex|_redoButtonIndex|_moveEvent|_physicalButtonsEvent|_wheelEvent|_physicalButtonMap|_physicalKeyboardEvent|_alwaysHitTestsForMainScreen|_backgroundHitTestWindow|_eventQueue|_childEventMap|_disableTouchCoalescingCount|_classicMode|_actionsPendingInitialization|_idleTimerDisabledReasons|_currentTimestampWhenFirstTouchCameDown|_currentLocationWhereFirstTouchCameDown|_currentActivityUUID|_currentActivityType|_sceneSettingsDiffInspector|_saveStateRestorationArchiveWithFileProtectionCompleteUntilFirstUserAuthentication|_simulatorShakeNotificationToken|_virtualHorizontalSizeClass|_virtualVerticalSizeClass|__expectedViewOrientation|_preferredContentSizeCategoryName|_lastTimestampWhenFirstTouchCameDown|_lastTimestampWhenAllTouchesLifted|_lastLocationWhereFirstTouchCameDown|_lastLocationWhereAllTouchesLifted|_virtualWindowSizeInSceneReferenceSpace

三、能够看app里确实有个关于状态栏的成员变量，咱们经过KVC取出它复制代码1 - (void)viewDidAppear:(BOOL)animated2 {3     // 状态栏是由当前app控制的，首先获取当前app4     UIApplication *app = [UIApplication sharedApplication];56     id statusBar = [app valueForKeyPath:@"statusBar"];78     // 遍历状态栏的全部成员9     unsigned int outCount = 0;10     Ivar *ivars = class_copyIvarList([statusBar class], &outCount);1112     for (int i = 0; i < outCount; i++) {13         Ivar ivar = ivars[i];14         printf("|%s", ivar_getName(ivar));15     }16 }复制代码运行后能够看到打印结果为

|_statusBarWindow|_statusBarServer|_inProcessProvider|_showsForeground|_backgroundView|_foregroundView|_doubleHeightLabel|_doubleHeightLabelContainer|_currentDoubleHeightText|_currentRawData|_interruptedAnimationCompositeViews|_newStyleBackgroundView|_newStyleForegroundView|_slidingStatusBar|_requestedStyle|_styleOverrides|_styleAttributes|_orientation|_hidden|_suppressesHiddenSideEffects|_foreground|_registered|_waitingOnCallbackAfterChangingStyleOverridesLocally|_suppressGlow|_translucentBackgroundAlpha|_showOnlyCenterItems|_localDataOverrides|_tintColor|_lastUsedBackgroundColor|_nextTintTransition|_overrideHeight|_disableRasterizationReasons|_persistentAnimationsEnabled|_simulatesLegacyAppearance|_serverUpdatesDisabled|_homeItemsDisabled|_styleDelegate|_foregroundColor|_legibilityStyle

四、状态栏里有foregroundView这个成员，应该表明着全部当前显示的视图，经过KVC取出它里面的全部子视图复制代码1 // 状态栏是由当前app控制的，首先获取当前app2     UIApplication *app = [UIApplication sharedApplication];34     NSArray *children = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];56     for (id child in children) {7         NSLog(@"--%@", [child class]);8   }复制代码打印结果为

 --UIStatusBarServiceItemView

2016-02-29 14:51:56.538 runtime[16977:130523] --UIStatusBarDataNetworkItemView

2016-02-29 14:51:56.538 runtime[16977:130523] --UIStatusBarBatteryItemView

2016-02-29 14:51:56.538 runtime[16977:130523] --UIStatusBarTimeItemView

五、遍历数组，取出用于显示网络状态的视图，并遍历其内部的全部成员变量复制代码1 // 状态栏是由当前app控制的，首先获取当前app2     UIApplication *app = [UIApplication sharedApplication];34     NSArray *children = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];56     for (id child in children) {7         if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {8             // 遍历当前状态栏的全部属性，找到关于状态栏的9             unsigned int outCount = 0;10             Ivar *ivars = class_copyIvarList([child class], &outCount);1112             for (int i = 0; i < outCount; i++) {13                 Ivar ivar = ivars[i];14                 printf("|%s", ivar_getName(ivar));15             }16         }17     }复制代码打印结果为

|_dataNetworkType|_wifiStrengthRaw|_wifiStrengthBars|_enableRSSI|_showRSSI

六、下面经过KVC，取出dataNetworkType1 if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {2             id type = [child valueForKeyPath:@"dataNetworkType"];3             NSLog(@"_dataNetworkType class is %@, value is %@", [type class], type);4         }打印结果为：

_dataNetworkType class is __NSCFNumber, value is 5

可见，dataNetworkType类型是NSNumber，值是5。

【以上均为模拟器测试】通过测试，发现，可能的值为 1，2，3，5 分别对应的网络状态是2G、3G、4G及WIFI。 当没有网络时，隐藏UIStatusBarDataNetworkItemView，没法获取dataNetworkType值总结：如下是完整的代码，并通过真机测试：复制代码1 - (void)viewDidAppear:(BOOL)animated2 {3     // 状态栏是由当前app控制的，首先获取当前app4     UIApplication *app = [UIApplication sharedApplication];56     NSArray *children = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];78     int type = 0;9     for (id child in children) {10         if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {11             type = [[child valueForKeyPath:@"dataNetworkType"] intValue];12         }13     }14     NSLog(@"----%d", type);15 }复制代码打印出的type数字对应的网络状态依次是：0 - 无网络; 1 - 2G; 2 - 3G; 3 - 4G; 5 - WIFI