无法从.plist中读取字符串

Question

我创建了.plist，其中我放置了用于谷歌分析的字符串，问题是该字符串无法传递到appdelegate.m中的代码，其中是谷歌分析代码。

configuration.plist看起来像这样： GAnalytics，字符串，“XXXXXXXX”

我已经创建了.h和.m文件供它阅读

configuration.h

#import <Foundation/Foundation.h>

@interface Configuration : NSObject

+(instancetype)sharedConfig;

-(NSString *)GoogleAnalyticsID;

@end

configuration.m

#import "Configuration.h"

@interface Configuration ()

@property (strong, nonatomic) NSDictionary *config;

@end

@implementation Configuration

+(instancetype)sharedConfig
{
    static Configuration *instance = nil;
    if (!instance) {
        instance = [[Configuration alloc] init];
    }
    return instance;
}

-(instancetype)init
{
    self = [super init];
    if (self) {
        NSBundle *bundle = [NSBundle mainBundle];
        NSString *configPath = [bundle pathForResource:@"Configuration" ofType:@"plist"];
        self.config = [NSDictionary dictionaryWithContentsOfFile:configPath];
    }
    return self;
}

-(NSString *)GoogleAnalyticsID
{
    return self.config[@"GAnalytics"];
}

@end

appdelegate.m

[GAI sharedInstance].trackUncaughtExceptions = YES;
[GAI sharedInstance].dispatchInterval = 20;
[[GAI sharedInstance] trackerWithTrackingId: [[Configuration sharedConfig] GoogleAnalyticsID]];