*** Assertion failure in -[CLLocationManager setAllowsBackgroundLocationUpdates:], /BuildRoot/Librar

iOS项目集成百度地图的时候必须设置后台模式，而AppStore上线时，项目中没有用到后台定位，导致2.16被拒，苹果要求你勾选掉Background Modes 中的Location Updates

但是当你勾选掉这个后台模式后，程序crash。crash原因如下：

*** Assertion failure in -[CLLocationManager setAllowsBackgroundLocationUpdates:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreLocationFramework_Sim/CoreLocation-1861.3.25.49/Framework/CoreLocation/CLLocationManager.m:609

断言失败：提示需要设置后台模式

冲突问题对比：

1.程序不勾选后台模式：

*** Assertion failure in -[CLLocationManager setAllowsBackgroundLocationUpdates:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreLocationFramework_Sim/CoreLocation-1861.3.25.49/Framework/CoreLocation/CLLocationManager.m:609

2.程序勾选上后台模式，但是app中没有用到后台定位：

苹果被拒反馈：2.16 - Multitasking Apps may only use background services for their intended purposes: VoIP, audio playback, location, task completion, local notifications, etc.

解决方案：

在项目中创建CLLationManager的类目，并导入到.pch文件中作为全局的，使用runtime方式来监听，代码如下：

#import "CLLocationManager+Extend.h"

#import <objc/runtime.h>

@implementation CLLocationManager (Extend)

+ (void)load {

    

    if ([UIDevicecurrentDevice].systemVersion.floatValue >=9.0) {

        method_exchangeImplementations(class_getInstanceMethod(self.class,NSSelectorFromString(@"setAllowsBackgroundLocationUpdates:")),

                                      class_getInstanceMethod(self.class,@selector(swizzledSetAllowsBackgroundLocationUpdates:)));

    }

    

}

- (void)swizzledSetAllowsBackgroundLocationUpdates:(BOOL)allow {

    if (allow) {

        NSArray* backgroundModes  = [[NSBundlemainBundle].infoDictionaryobjectForKey:@"UIBackgroundModes"];

        

        if( backgroundModes && [backgroundModescontainsObject:@"location"]) {

            [selfswizzledSetAllowsBackgroundLocationUpdates:allow];

        }else{

            NSLog(@"APP想设置后台定位，但APP的info.plist里并没有申请后台定位");

        }

    }else{

        [selfswizzledSetAllowsBackgroundLocationUpdates:allow];

    }

}

@end