iPhone X 上获取状态栏网络状态的方法
获取网络状态常用的库是Reachability。但是这个库存在一些问题，替代的方法是从状态栏获取网络状态。一般的写法是：
typedef enum {
NetWorkType_None = 0,
NetWorkType_2G,
NetWorkType_3G,
NetWorkType_4G,
NetWorkType_LTE,
NetWorkType_WiFi,
} NetWorkType;
UIApplication *application = [UIApplication sharedApplication];
NSArray *subviews = [[[application valueForKey:@"statusBar"] valueForKey:@"foregroundView"]subviews];
NSNumber *dataNetWorkItemView = nil;
for (id subView in subviews) {
if ([subView isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
dataNetWorkItemView = subView;
break;
}
}
NetWorkType networkType = NetWorkType_None;
switch ([[dataNetWorkItemView valueForKey:@"dataNetworkType"] integerValue]) {
case 1:
networkType = NetWorkType_2G;
break;
case 2:
networkType = NetWorkType_3G;
break;
case 3:
networkType = NetworkType_4G;
break;
case 4:
networkType = NetworkType_LTE;
break;
case 5:
networkType = NetworkType_WiFi;
break;
default:
networkType = NetWorkType_None;
break;
}
return networkType;
}
这样的方法在iPhone X上会闪退。因为iPhone X上导航栏会改用UIStatusBar_Modern类，结构跟之前大不相同。为了在iPhone X上获取状态栏上的网络状态，试过运行时查看状态栏里的内容，然而模拟器的网络状态只有WiFi。没有真机，无法获知移动网络时的区别。那么只能视图获取状态栏的数据源，用反编译工具Hopper里查看状态栏初始化，找到了数据源+[UIStatusBarServer getStatusBarData]。方法返回值是结构体，可以运行时去获取具体结构，推荐使用https://github.com/nst/RuntimeBrowser工具，得到返回的结构体如下：
struct StatusBarData {
/* 0 时间
* 2 飞行模式
* 6 网络类型
* 8 电池
*/
bool itemIsEnabled[35];
char timeString[64];
char shortTimeString[64];
int gsmSignalStrengthRaw;
int gsmSignalStrengthBars;
char serviceString[100];
char serviceCrossfadeString[100];
char serviceImages[2][100];
char operatorDirectory[1024];
unsigned int serviceContentType;
int wifiSignalStrengthRaw;
int wifiSignalStrengthBars;
unsigned int dataNetworkType;
int batteryCapacity;
unsigned int batteryState;
char batteryDetailString[150];
int bluetoothBatteryCapacity;
int thermalColor;
unsigned int thermalSunlightMode : 1;
unsigned int slowActivity : 1;
unsigned int syncActivity : 1;
char activityDisplayId[256];
unsigned int bluetoothConnected : 1;
unsigned int displayRawGSMSignal : 1;
unsigned int displayRawWifiSignal : 1;
unsigned int locationIconType : 1;
unsigned int quietModeInactive : 1;
unsigned int tetheringConnectionCount;
unsigned int batterySaverModeActive : 1;
unsigned int deviceIsRTL : 1;
unsigned int lock : 1;
char breadcrumbTitle[256];
char breadcrumbSecondaryTitle[256];
char personName[100];
unsigned int electronicTollCollectionAvailable : 1;
unsigned int wifiLinkWarning : 1;
unsigned int wifiSearching : 1;
double backgroundActivityDisplayStartDate;
};
其中有些字段明显是字符串，解析出来是bool，我手动修改了下类型。那么就可以写出获取状态栏的网络状态的方法：
+ (int)networkType
{
Class cls = NSClassFromString(@"UIStatusBarServer");
SEL selector = NSSelectorFromString(@"getStatusBarData");
NSMethodSignature *signature = [cls methodSignatureForSelector:selector];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
invocation.target = cls;
invocation.selector = selector;
[invocation invoke];
struct {
bool x1[35];
BOOL x2[64];
BOOL x3[64];
int x4;
int x5;
BOOL x6[100];
BOOL x7[100];
BOOL x8[2][100];
BOOL x9[1024];
unsigned int x10;
int x11;
int x12;
unsigned int x13;
int x14;
unsigned int x15;
BOOL x16[150];
int x17;
int x18;
unsigned int x19 : 1;
unsigned int x20 : 1;
unsigned int x21 : 1;
BOOL x22[256];
unsigned int x23 : 1;
unsigned int x24 : 1;
unsigned int x25 : 1;
unsigned int x26 : 1;
unsigned int x27 : 1;
unsigned int x28;
unsigned int x29 : 1;
unsigned int x30 : 1;
unsigned int x31 : 1;
BOOL x32[256];
BOOL x33[256];
BOOL x34[100];
unsigned int x35 : 1;
unsigned int x36 : 1;
unsigned int x37 : 1;
double x38;
} * data;
[invocation getReturnValue:&data];
int networkType = data->x13;
return networkType;
}
之所以结构体内字段没有按照原来的名字，是担心审核不通过。加入这个方法的应用已经在审核中，还没有结果审核通过。需要注意的是这个方法在iOS 11下才可以这样调用。因为返回的结构体在不同的iOS版本中不同。如果希望在各个版本都用这样的方法，那么需要了解所有支持的版本的返回结构体构造。
接下来探索下修改状态栏。用Method Swizzling的方法修改这个方法的返回值。
@implementation NSObject (Hook)
+ (void)load
{
Method m1 = class_getClassMethod(NSClassFromString(@"UIStatusBarServer"), @selector(getStatusBarData));
Method m2 = class_getClassMethod(self, @selector(hook_getStatusBarData));
method_exchangeImplementations(m1, m2);
}
+ (struct StatusBarData *)hook_getStatusBarData
{
struct StatusBarData *ret = [self hook_getStatusBarData];
ret->dataNetworkType = 3;
strcpy(ret->breadcrumbTitle, "hahaha");
strcpy(ret->breadcrumbSecondaryTitle, "huhuhu");
strcpy(ret->personName, "personName");
ret->thermalSunlightMode = YES;
ret->batterySaverModeActive = YES;
ret->deviceIsRTL = YES;
ret->batteryState = 3;
ret->batteryCapacity = 500;
ret->serviceContentType = 5;
ret->electronicTollCollectionAvailable = YES;
return ret;
}
@end
这段代码跑起来，状态栏已经被改得乱七八糟了😝。
