ios扩展的一些知识点

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    if (coordinator) {
        
    }else {
        
    }
}

导航显示内容:
- (void)widgetPerformUpdateWithCompletionHandler:(Void) (^)(NCUpdateResult))completionHandler {
    [self getPosts:^(BOOL didUpdate) {
        
    }];
}

系统分享功能:
self.audienceConfigurationItem.tapHandler = ^{
	ShareViewController *strongSelf = weakSelf;
	if (strongSelf) {
		AudiencePickerViewController *audiencePicker = [[AudiencePickerViewController alloc] init];
		audiencePicker.delegate = strongSelf;
		audiencePicker.selectedAudience = strongSelf.audience;
		[strongSelf pushConfigurationViewController:audiencePicker];
	}
}

- (void)AudiencePickerViewController:(AudiencePickerViewController *)
	audiencePickerViewController didSelectAudience:(NSString *)audience {
		self.audience = audience;
		self.audienceConfigurationItem.value = http://www.mamicode.com/self.audience;>