一、问题：解决在Xcode11适配 iOS14 的问题
解决
- 我们使用Xcode11没有iOS14的库，
- Xcode12 beta无法上架
- 将Xcode12 beta中的系统库导入到 Xcode11 中，提交会被拒
二、思路：
其实很简单，就是将Xcode12的系统库Copy到 xcode11的同级系统库的位置，然后在代码中调用
⚠️ 注意：我们不能直接调用，需要借助runtime的反射间接调用
三、解决方案：
第一步：
我们需要将Xcode12 Beta版本中的 AppTrackingTransparency.framework 复制（Copy）到Xcode11 的同级目录下
Xcode12 Beta 版本中的 AppTrackingTransparency.framework 路径：
真机：/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/AppTrackingTransparency.framework
模拟器：/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/AppTrackingTransparency.framework
⚠️要把 静态库 Copy 到Xcode11的相同路径下，Xcode11路径跟上面的路径一致
第二步：
在项目 - target - Build Phases - Link Binary With Libraries中导入 AppTrackingTransparency.framework 系统库
第三步：
由于我们n在低版本的Xcode中使用 高版本的系统库，所以我们需要通过runtime的反射去使用系统库
我们需要创建一个对应的Runtime反射类 bATTrackingManager.h
.h 文件 bATTrackingManager.h 完全 Copy ATTrackingManager.h中的内容，并将类名由 ATTrackingManager 改为 bATTrackingManager，代码如下
#import <Foundation/Foundation.h>
#import <os/availability.h>
typedef NS_ENUM(NSUInteger, ATTrackingManagerAuthorizationStatus) {
ATTrackingManagerAuthorizationStatusNotDetermined = 0,
ATTrackingManagerAuthorizationStatusRestricted,
ATTrackingManagerAuthorizationStatusDenied,
ATTrackingManagerAuthorizationStatusAuthorized
} NS_SWIFT_NAME(ATTrackingManager.AuthorizationStatus) API_AVAILABLE(ios(14), macosx(10.16), tvos(14));
API_AVAILABLE(ios(14), macosx(10.16), tvos(14))
@interface bATTrackingManager : NSObject
/*!
* @property trackingAuthorizationStatus
*
* @abstract
* Returns information about your application’s tracking authorization status.
* Users are able to grant or deny developers tracking privileges on a per-app basis.
* Application developers must call `requestTrackingAuthorizationWithCompletionHandler:` for the ability to track users.
*
* @result
* The current authorization status. If the user has not yet been prompted to approve access, the return value will either be
* ATTrackingManagerAuthorizationStatusNotDetermined, or ATTrackingManagerAuthorizationStatusRestricted if this value is managed.
* Once the user has been prompted, the return value will be either ATTrackingManagerAuthorizationStatusDenied or ATTrackingManagerAuthorizationStatusAuthorized.
*/
@property (class, nonatomic, readonly, assign) ATTrackingManagerAuthorizationStatus trackingAuthorizationStatus;
/*!
* @method requestTrackingAuthorizationWithCompletionHandler:completion:
*
* @abstract
* Request user tracking authorization with a completion handler returning the user's authorization status.
* Users are able to grant or deny developers tracking privileges on a per-app basis.
* This method allows developers to determine if access has been granted. On first use, this method will prompt the user to grant or deny access.
*
* The completion handler will be called with the result of the user's decision for granting or denying permission to use application tracking.
* The completion handler will be called immediately if access to request authorization is restricted.
*/
+ (void)requestTrackingAuthorizationWithCompletionHandler:(void(^)(ATTrackingManagerAuthorizationStatus status))completion;
// This class, at this time, should not be instantiated.
+ (instancetype)new NS_UNAVAILABLE;
// This class, at this time, should not be instantiated.
- (instancetype)init NS_UNAVAILABLE;
@end
bATTrackingManager.m文件实现需要做两个处理*
#import "bATTrackingManager.h"
#import <objc/runtime.h>
#import <objc/message.h>
@implementation bATTrackingManager
+ (ATTrackingManagerAuthorizationStatus)trackingAuthorizationStatus {
Class ATTrackingManager = NSClassFromString(@"ATTrackingManager");
if (ATTrackingManager == nil) {
NSBundle *bundle = [NSBundle bundleWithPath:@"/System/Library/Frameworks/AppTrackingTransparency.framework"];
[bundle load];
ATTrackingManager = NSClassFromString(@"ATTrackingManager");
}
ATTrackingManagerAuthorizationStatus returnValue = ((int (*)(id, SEL)) objc_msgSend)(ATTrackingManager, _cmd);
return returnValue;
}
+ (void)requestTrackingAuthorizationWithCompletionHandler:(void(^)(ATTrackingManagerAuthorizationStatus status))completion {
Class ATTrackingManager = NSClassFromString(@"ATTrackingManager");
if (ATTrackingManager == nil) {
NSBundle *bundle = [NSBundle bundleWithPath:@"/System/Library/Frameworks/AppTrackingTransparency.framework"];
[bundle load];
ATTrackingManager = NSClassFromString(@"ATTrackingManager");
}
((void (*)(id, SEL, void(^)(ATTrackingManagerAuthorizationStatus status))) objc_msgSend)(ATTrackingManager, _cmd, completion);
}
@end
下面针对上面的代码解释：
// 动态的链接 AppTrackingTransparency.framework 库
NSBundle *bundle = [NSBundle bundleWithPath:@"/System/Library/Frameworks/AppTrackingTransparency.framework"];
[bundle load];
// Runtime反射调用AppTrackingTransparency.framework库
Class ATTrackingManager = NSClassFromString(@"ATTrackingManager");
ATTrackingManagerAuthorizationStatus returnValue = ((int (*)(id, SEL)) objc_msgSend)(ATTrackingManager, _cmd);
Class ATTrackingManager = NSClassFromString(@"ATTrackingManager");
((void (*)(id, SEL, void(^)(ATTrackingManagerAuthorizationStatus status))) objc_msgSend)(ATTrackingManager, _cmd, completion);
第四步：将代码里使用到的 ATTrackingManager 全部替换为 bATTrackingManager
or在需要的地方调用，代码如下：
#import "bATTrackingManager.h"
#import <AdSupport/ASIdentifierManager.h>
#import <AppTrackingTransparency/AppTrackingTransparency.h>
if (@available(iOS 14, *)) {
// iOS14及以上版本需要先请求权限
[bATTrackingManager requestTrackingAuthorizationWithCompletionHandler:^(ATTrackingManagerAuthorizationStatus status) {
// 获取到权限后，依然使用老方法获取idfa
if (status == ATTrackingManagerAuthorizationStatusAuthorized) {
NSString *idfa = [[ASIdentifierManager sharedManager].advertisingIdentifier UUIDString];
NSLog(@"%@",idfa);
} else {
NSLog(@"请在设置-隐私-Tracking中允许App请求跟踪");
}
}];
} else {
// iOS14以下版本依然使用老方法
// 判断在设置-隐私里用户是否打开了广告跟踪
if ([[ASIdentifierManager sharedManager] isAdvertisingTrackingEnabled]) {
NSString *idfa = [[ASIdentifierManager sharedManager].advertisingIdentifier UUIDString];
NSLog(@"%@",idfa);
} else {
NSLog(@"请在设置-隐私-广告中打开广告跟踪功能");
}
}
到此，完成了Xcode11 对iOS13 AppTrackingTransparency.framework库的支持，可以打包上架了。
