前言
在需要精确掌握时间的场景中，例如抢购活动或需要在整点进行操作的情况下，用户往往需要准确了解当前的秒数。然而，iOS 系统默认的状态栏时间显示并不包含秒数，这给用户带来了不便。
为了解决这一问题，开发一个在状态栏显示秒数的插件，可以帮助用户实时掌握精确时间，提升在特定场景下的操作效率。
本篇文章将探讨如何在 iOS 系统中开发这样一个插件，旨在为用户提供更精确的时间显示。
一、目标
见下图的状态栏时间位置：
二、开发环境和工具清单
mac 系统
frida：动态调试
已越狱 iOS 设备：脱壳及 frida 调试
IDA Pro：静态分析
三、步骤
1、查找设置状态栏日期的调用栈
在终端执行命令frida-trace -U -m "*[UILabel setText:]" SpringBoard
并修改 setText_.js：
defineHandler({ onEnter(log, args, state) { log(`-[UILabel setText:${ObjC.Object(args[2])}]`); log('UILabel setText called from:\n' + Thread.backtrace(this.context, Backtracer.ACCURATE) .map(DebugSymbol.fromAddress).join('\n') + '\n'); }, onLeave(log, retval, state) { }});
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当时间有变化时，获取到的堆栈信息如下：
-[_UIStatusBarStringView setText:0x282967570]-[UILabel setText:下午9:56]UILabel setText called from:0x1afd16180 UIKitCore!-[_UIStatusBarStringView setText:]0x1afcf71fc UIKitCore!-[_UIStatusBarTimeItem applyUpdate:toDisplayItem:]0x1afcfeca4 UIKitCore!-[_UIStatusBarItem _applyUpdate:toDisplayItem:]0x1afd5381c UIKitCore!-[_UIStatusBarDisplayItemState updateWithData:styleAttributes:]0x1afd3be04 UIKitCore!__78-[_UIStatusBar _updateDisplayedItemsWithData:styleAttributes:extraAnimations:]_block_invoke_20x1ad1b2adc CoreFoundation!__NSDICTIONARY_IS_CALLING_OUT_TO_A_BLOCK__0x1ad129280 CoreFoundation!-[__NSDictionaryM enumerateKeysAndObjectsWithOptions:usingBlock:]0x1afd3bb60 UIKitCore!-[_UIStatusBar _updateDisplayedItemsWithData:styleAttributes:extraAnimations:]0x1afd3b7d0 UIKitCore!-[_UIStatusBar _updateWithAggregatedData:]0x1afd39af4 UIKitCore!__30-[_UIStatusBar initWithStyle:]_block_invoke0x1afd4f004 UIKitCore!-[_UIStatusBarDataAggregator _updateForCoalescedKeysWithData:]0x1afd4ea98 UIKitCore!-[_UIStatusBarDataAggregator _updateForDelayedKeysWithData:]0x1afd4e9d8 UIKitCore!-[_UIStatusBarDataAggregator _updateForOverlayWithData:]0x1afd4e3b0 UIKitCore!-[_UIStatusBarDataAggregator updateWithData:]0x1afd3b4f4 UIKitCore!-[_UIStatusBar _updateWithData:completionHandler:]0x1afd7d28c UIKitCore!-[UIStatusBar_Modern _updateWithData:force:]
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获取到关键方法：[_UIStatusBarTimeItem applyUpdate:toDisplayItem:]
2、查看[_UIStatusBarTimeItem applyUpdate:toDisplayItem:]的源码
使用 ida pro9 反编译 dyld_shared_cache 源码。并定位到该方法，获取到关键的伪代码如下：
v38 = objc_retainAutoreleasedReturnValue(objc_msgSend(v6, "data"));v39 = objc_retainAutoreleasedReturnValue(objc_msgSend(v38, "shortTimeEntry"));v40 = objc_retainAutoreleasedReturnValue(objc_msgSend(v39, "stringValue"));v41 = -[_UIStatusBarTimeItem pillTimeView](self, "pillTimeView");v42 = objc_retainAutoreleasedReturnValue(v41);objc_msgSend(v42, "setText:", v40);
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获取到关键方法 stringValue
3、trace stringValue 方法
在终端执行命令frida-trace -U -m "*[* stringValue]" SpringBoard,当时间有变化时，获取到的堆栈信息如下：
-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]
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修改__handlers__/_UIStatusBarDataStringEntry/stringValue.js
defineHandler({ onEnter(log, args, state) { log(`-[_UIStatusBarDataStringEntry stringValue]`); },
onLeave(log, retval, state) { log(`-[_UIStatusBarDataStringEntry stringValue]=${ObjC.Object(retval)}=`);
}});
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然后再次运行frida-trace -U -m "*[* stringValue]" SpringBoard,当时间有变化时，获取到的堆栈信息如下：
-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=nil=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=3月4日周二=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=下午10:09=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=10:09=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=下午10:10=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=nil=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=3月4日周二=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=下午10:10=-[_UIStatusBarDataStringEntry stringValue]-[_UIStatusBarDataStringEntry stringValue]=10:10=
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确定_UIStatusBarDataStringEntry 就是状态栏时间的来源后，继续执行frida-trace -U -m "*[_UIStatusBarDataStringEntry *]" SpringBoard,当时间有变化时，获取到的堆栈信息如下：
-[_UIStatusBarDataStringEntry initFromData:0x1087fc000 type:0x0 string:0x1087fc02b maxLength:0x40]_UIStatusBarDataStringEntry initFromData called from:0x1afd4fe8c UIKitCore!+[_UIStatusBarDataConverter convertData:fromReferenceData:]0x1afd7c788 UIKitCore!-[UIStatusBar_Modern _dataFromLegacyData:]0x1afd7e214 UIKitCore!-[UIStatusBar_Modern statusBarServer:didReceiveStatusBarData:withActions:]0x1afd5ec1c UIKitCore!-[UIStatusBarServer _receivedStatusBarData:actions:animated:]0x1afd5ee28 UIKitCore!_UIStatusBarReceivedStatusBarDataAndActions0x1b020f130 UIKitCore!_XReceivedStatusBarDataAndActions0x1b4413ef0 AppSupport!migHelperRecievePortCallout0x1ad1c8fe8 CoreFoundation!__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__0x1ad1c8378 CoreFoundation!__CFRunLoopDoSource10x1ad1c208c CoreFoundation!__CFRunLoopRun0x1ad1c121c CoreFoundation!CFRunLoopRunSpecific0x1c4cc5784 GraphicsServices!GSEventRunModal0x1afbfffe0 UIKitCore!-[UIApplication _run]0x1afc05854 UIKitCore!UIApplicationMain0x1d2970194 SpringBoard!SBSystemAppMain0x1ace816b0 libdyld.dylib!start
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通过堆栈信息分析，确认-[UIStatusBarServer _receivedStatusBarData:actions:animated:]为我们的目标对象
4、使用 frida 验证使用效果：
执行命令frida-trace -U -m "-[UIStatusBarServer _receivedStatusBarData:actions:animated:]" SpringBoard后，修改该 js 文件内容为：
defineHandler({ onEnter(log, args, state) { log(`-[UIStatusBarServer _receivedStatusBarData:${args[2]} actions:${args[3]} animated:${args[4]}]`); var structPtr = args[2];
log("Original timeString:", structPtr.add(43).readCString(64));
const now = new Date(); const hours = String(now.getHours()).padStart(2, '0'); // 补零 const minutes = String(now.getMinutes()).padStart(2, '0'); // 补零 const seconds = String(now.getSeconds()).padStart(2, '0'); // 补零 var newTimeString = `${hours}:${minutes}:${seconds}`;
structPtr.add(43).writeUtf8String(newTimeString);
log("Updated timeString:", structPtr.add(43).readCString(64)); },
onLeave(log, retval, state) { }});
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当状态栏日期变化后。日期正常显示秒表，说明该函数可用。
5、编写 tweak 代码
Tweak.x 源码如下：
#import <CoreFoundation/CoreFoundation.h>#import <Foundation/Foundation.h>#import <Foundation/NSUserDefaults+Private.h>#import "StatusBarUpdater.h"#import "Structs.h"#import "headers.h"#include <string.h>#include <sys/time.h>static NSString * nsDomainString = @"com.witchan.precise-time";static NSString * nsNotificationString = @"com.witchan.precise-time/preferences.changed";static BOOL enabled;
static void notificationCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo) { NSNumber * enabledValue = (NSNumber *)[[NSUserDefaults standardUserDefaults] objectForKey:@"enabled" inDomain:nsDomainString]; enabled = (enabledValue)? [enabledValue boolValue] : YES; NSLog(@"=witchan= 插件状态：%d", enabled);}
%hook UIStatusBarServer%property (nonatomic, strong) StatusBarUpdater *updater;
// SCD_Struct_UI104结构请从ida pro复制-(void)_receivedStatusBarData:(SCD_Struct_UI104*)arg1 actions:(int)arg2 animated:(BOOL)arg3 { if (self.updater == nil) { self.updater = [[StatusBarUpdater alloc] init]; }
if (!enabled) { [self.updater stopUpdating]; %orig; return; } // 获取当前时间 NSDate *currentDate = [NSDate date]; // 创建日期格式化器 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; // 设置日期格式 [dateFormatter setDateFormat:@"HH:mm:ss"]; // 24小时制 // 将当前日期格式化为字符串 NSString *formattedTime = [dateFormatter stringFromDate:currentDate]; NSLog(@"=witchan= now timeString: %@", formattedTime); // _statusBarData.var1 = strcpy(ret->personName, "12:33:22");
strcpy(arg1->var1, [formattedTime UTF8String]);
%orig(arg1, arg2, arg3); NSLog(@"=witchan= _receivedStatusBarData: %d %d", arg2, arg3);
// 创建一个新结构体用于复制 // SCD_Struct_UI104 copy; // memcpy(©, arg1, sizeof(SCD_Struct_UI104)); // 正确复制结构体数据
[self.updater updateStatusBarData:*arg1 statusBarServer: self]; [self.updater startUpdating];}
%end
%ctor {
NSLog(@"=witchan= precise time plugin load success"); notificationCallback(NULL, NULL, NULL, NULL, NULL);
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, notificationCallback, (CFStringRef)nsNotificationString, NULL, CFNotificationSuspensionBehaviorCoalesce);}
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完整源码下载地址：https://pan.quark.cn/s/e1152c2f7899
总结
通过上述方法，用户可以在状态栏或屏幕上方实时查看秒数，满足在特定场景下对精确时间的需求，提升操作效率和成功率。
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