1、iPad上Present imagePicker失效的問題

dispatch_async(dispatch_get_main_queue(), ^ { ? ? ?

????[self presentViewController:imagePickerController animated:YES completion:nil];

});

作者：YoRuo_

鏈接：http://www.itdecent.cn/p/92ce67684941

來源：簡書

2、self.navigationController.hidesBarsOnSwipe = YES

// 由于設置self.navigationController.hidesBarsOnSwipe = YES;之后，在滑動隱藏navigationBar之后返回時會有內(nèi)存泄漏，所以使用UIScrollViewDelegate的方法，來進行navigationBar的隱藏與展示。

- (void)scrollViewDidScroll:(UIScrollView*)scrollView {

? ? CGFloaty Velocity = [scrollView.panGestureRecognizer velocityInView:scrollView].y;

? ? if (yVelocity > 0 && !self.statusBarAnimationInProgress) {

? ? ? ? [self setNavigationBarHidden:NO];

? ? }?else?if?(yVelocity <0&& !self.statusBarAnimationInProgress) {

? ? ? ? [self setNavigationBarHidden:YES];

? ? }

}

- (void)setNavigationBarHidden:(BOOL)hidden {

? ? [CATransaction begin];

? ? self.statusBarAnimationInProgress = YES;

? ? [CATransaction setCompletionBlock:^{

? ? ? ? self.statusBarAnimationInProgress = NO;

? ? }];

? ? [self.navigationController setNavigationBarHidden:hidden animated:YES];

? ? [CATransaction commit];

}