我在父视图控制器中显示navigationBar
:
- (void)viewWillDisappear:(BOOL)animated
{
[self.navigationController setNavigationBarHidden:NO animated:YES];
[super viewWillDisappear:animated];
}
然后,在下一个视图控制器中
- (void)viewDidLoad
{
/* ... */
NSLog(@"%i, %g", self.navigationController.navigationBarHidden,
self.view.frame.size.height);
}
- (void)viewWillAppear:(BOOL)animated
{
/* ... */
[super viewWillAppear:animated];
NSLog(@"%i, %g", self.navigationController.navigationBarHidden,
self.view.frame.size.height);
}
- (void)viewWillLayoutSubviews
{
NSLog(@"%i, %g", self.navigationController.navigationBarHidden,
self.view.frame.size.height);
}
- (void)viewDidAppear:(BOOL)animated
{
NSLog(@"%i, %g", self.navigationController.navigationBarHidden,
self.view.frame.size.height);
}
输出:
-[viewDidLoad]: 1, 416
-[viewWillAppear:]: 0, 460
-[viewWillLayoutSubviews]: 0, 416
-[viewDidAppear:]: 0, 416
如您所见viewWillAppear
出错self.view.frame.size.height
。可以使用viewWillLayoutSubviews
,但它是在iOS5中引入的。是否可以在viewWillAppear中获得正确的帧高?
答案 0 :(得分:2)
这是迄今为止我得到的最佳解决方案:
- (void)viewWillAppear:(BOOL)animated
{
/* recalculate frame size */
CGSize size = [UIScreen mainScreen].bounds.size;
UIApplication *application = [UIApplication sharedApplication];
if (UIInterfaceOrientationIsLandscape(application.statusBarOrientation))
size = CGSizeMake(size.height, size.width);
if (!application.statusBarHidden)
size.height -= MIN(application.statusBarFrame.size.width,
application.statusBarFrame.size.height);
CGRect frame = self.view.frame;
frame.size.height = size.height -
self.navigationController.navigationBar.frame.size.height;
self.view.frame = frame;
/* ... */
}