PodSpec 书写导致的内存泄漏

代码地址：TestBuilder

问题代码:

- (void)viewDidLoad {
    [super viewDidLoad];
    TestDispatchObjcA *builderA = [TestDispatchObjcA new];
    [builderA buildComposition];

    TestDispatchObjcB *builderB = [TestDispatchObjcB new];
    [builderB buildComposition];    
}
………………
………………

@interface TestDispatchObjcB
@end
@implementation TestDispatchObjcB
#pragma mark - Composition
    - (void)buildComposition {
    dispatch_group_t dispatchGroupInner = dispatch_group_create();
    dispatch_group_enter(dispatchGroupInner);
    NSLog(@"Entering item");
    dispatch_group_leave(dispatchGroupInner);
    dispatch_group_notify(dispatchGroupInner, dispatch_get_main_queue(), ^{
    });
}
@end

问题描述：调用下面代码会导致内存泄漏

TestDispatchObjcB *builderB = [TestDispatchObjcB new];
[builderB buildComposition];

问题解决方式：

将 PodSpec 文件中 s.platform = :ios, “5.0” 修改到 8.0 后 重新 pod install 就能够解决问题。