旋转为横向然后返回纵向后，iOS边界发生变化 [英] iOS bounds change after rotating to landscape, then back to portrait
问题描述
启动应用程序时，视图边界的NSLog显示以下内容:
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {320, 548}}
然后我旋转模拟器并得到以下信息:
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {320, 548}}
然后，当我将模拟器旋转回为肖像时，我得到了:
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {568, 300}}
我正在使用的两种方法来调整元素，但尚未完成，因为我目前正在为新iphone修复它们.
-(void) resizeForLandscape
{
newsLabel = (UILabel *)[self.view viewWithTag:50];
weatherLabel = (UILabel *)[self.view viewWithTag:51];
sportsLabel = (UILabel *)[self.view viewWithTag:52];
entertainmentLabel = (UILabel *)[self.view viewWithTag:53];
videosLabel = (UILabel *)[self.view viewWithTag:54];
moreLabel = (UILabel *)[self.view viewWithTag:55];
NSLog(@"resizeForLandscape called");
webView.frame = CGRectMake(0, 31, self.view.frame.size.width, self.view.frame.size.height - 75);
button.frame = CGRectMake(0, 0, image.size.width -30, image.size.height -15);
myLabel.frame = CGRectMake(230, 100, 80, 21);
label.frame = CGRectMake(0, 0, self.view.bounds.size.height + 15, 30);
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
NSLog(@"my status bar height is %f", [UIApplication sharedApplication].statusBarFrame.size.height);
NSLog(@"my status bar width is %f", [UIApplication sharedApplication].statusBarFrame.size.width);
newsLabel.frame = CGRectMake((self.view.bounds.size.height - 346) / 2 + 12, self.view.bounds.size.width - 38, 43, 21);
weatherLabel.frame = CGRectMake(newsLabel.frame.origin.x + 64, self.view.bounds.size.width - 38, 42, 21);
sportsLabel.frame = CGRectMake(newsLabel.frame.origin.x + 126, self.view.bounds.size.width - 38, 42, 21);
entertainmentLabel.frame = CGRectMake(newsLabel.frame.origin.x + 185, self.view.bounds.size.width - 38, 66, 21);
videosLabel.frame = CGRectMake(newsLabel.frame.origin.x + 269, self.view.bounds.size.width - 38, 42, 21);
moreLabel.frame = CGRectMake(newsLabel.frame.origin.x + 325, self.view.bounds.size.width - 38, 42, 21);
spacer1.width = (self.view.bounds.size.height - 346) / 2;
spacer2.width = 40;
spacer3.width = 28;
spacer4.width = 42;
spacer5.width = 35;
spacer6.width = 24;
}
-(void) resizeForPortrait
{
newsLabel = (UILabel *)[self.view viewWithTag:50];
weatherLabel = (UILabel *)[self.view viewWithTag:51];
sportsLabel = (UILabel *)[self.view viewWithTag:52];
entertainmentLabel = (UILabel *)[self.view viewWithTag:53];
videosLabel = (UILabel *)[self.view viewWithTag:54];
moreLabel = (UILabel *)[self.view viewWithTag:55];
NSLog(@"resizeForPortrait called");
webView.frame = CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height -88);
button.frame = CGRectMake(0, 0, image.size.width, image.size.height);
myLabel.frame = CGRectMake(145, 152, 80, 21);
label.frame = CGRectMake(0, 0, 315, 40);
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
NSLog(@"my status bar height is %f", [UIApplication sharedApplication].statusBarFrame.size.height);
NSLog(@"my status bar width is %f", [UIApplication sharedApplication].statusBarFrame.size.width);
float myWidth = MIN(self.view.bounds.size.height, self.view.bounds.size.width);
float myHeight = MAX(self.view.bounds.size.height, self.view.bounds.size.width);
newsLabel.frame = CGRectMake(newsLabel.frame.origin.x, myHeight - 18, 43, 21);
weatherLabel.frame = CGRectMake(newsLabel.frame.origin.x + 43, myHeight - 18, 42, 21);
sportsLabel.frame = CGRectMake(newsLabel.frame.origin.x + 97, myHeight - 18, 42, 21);
entertainmentLabel.frame = CGRectMake(newsLabel.frame.origin.x + 138, myHeight - 18, 66, 21);
videosLabel.frame = CGRectMake(newsLabel.frame.origin.x + 213, myHeight - 18, 42, 21);
moreLabel.frame = CGRectMake(newsLabel.frame.origin.x + 258, myHeight - 18, 42, 21);
spacer1.width = (myWidth - 346) / 2;
spacer2.width = 20;
spacer3.width = 18;
spacer4.width = 25;
spacer5.width = 28;
spacer6.width = 14;
}
致电者:
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
[self resizeForLandscape];
} else {
[self resizeForPortrait];
}
}
- (void) getOrientationandResize
{
if (UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)) {
[self resizeForLandscape];
} else {
[self resizeForPortrait];
}
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self getOrientationandResize];
}
我的头快要爆炸了.不仅视图颠倒了，而且从宽度上抢走了20个像素，并赋予了高度.谁能向我解释一下，以及我如何/应该对视图中的元素进行编码以解决这个问题?
我的故事板如下:
我的初步看法:
第一次旋转后(仍然良好)
旋转回纵向(由于边界值而被拧紧)
几乎应该永远不要在willRotateToInterfaceOrientation:duration:中进行布局.系统向您发送willRotateToInterfaceOrientation:duration:时，它尚未将视图的框架更新为新的大小.因此，通过咨询self.view.frame，您将框架用于当前(旧)方向，不将框架用于新(尚未旋转)方向.
您也不应该在viewDidAppear:中进行布局，因为到收到viewDidAppear:时，您的视图已经在屏幕上了.您需要先在屏幕上进行布局.
您需要使用适当的方法进行布局.进行布局的最佳位置是自定义UIView子类的layoutSubviews方法.将其放在此处可使视图逻辑与控制器逻辑分离.
下一个最好的布局是在视图控制器的viewWillLayoutSubviews或viewDidLayoutSubviews方法中.
如果将布局代码放在layoutSubviews，viewWillLayoutSubviews或viewDidLayoutSubviews中，系统将自动调用该方法，然后视图显示在屏幕上和动画块内自转.在这两种情况下，它都会在向您发送消息之前将视图的框架更新为正确的方向.
如果需要在自动旋转动画开始之前先隐藏视图，然后再显示，则可以在willRotateToInterfaceOrientation:duration:和didRotateFromInterfaceOrientation:中进行.
如果只想在自动旋转过程中仅执行特殊动画，而不是在初始视图布局中执行特殊动画，则可以在willAnimateRotationToInterfaceOrientation:duration:中执行该操作，在自动旋转动画块内称为willAnimateRotationToInterfaceOrientation:duration:. /p>
您可能会发现此答案很有帮助: UIViewController返回无效帧吗?
When my application launches, an NSLog of my view's bounds shows the following:
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {320, 548}}
I then rotate the simulator and get the following:
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {320, 548}}
Then when I rotate the simulator back to portait, I get this:
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
My view frame: {{0, 0}, {568, 300}}
The two methods I'm using to adjust elements are these, they aren't done yet, as I'm currently in the middle of fixing them for the new iphone.
-(void) resizeForLandscape
{
newsLabel = (UILabel *)[self.view viewWithTag:50];
weatherLabel = (UILabel *)[self.view viewWithTag:51];
sportsLabel = (UILabel *)[self.view viewWithTag:52];
entertainmentLabel = (UILabel *)[self.view viewWithTag:53];
videosLabel = (UILabel *)[self.view viewWithTag:54];
moreLabel = (UILabel *)[self.view viewWithTag:55];
NSLog(@"resizeForLandscape called");
webView.frame = CGRectMake(0, 31, self.view.frame.size.width, self.view.frame.size.height - 75);
button.frame = CGRectMake(0, 0, image.size.width -30, image.size.height -15);
myLabel.frame = CGRectMake(230, 100, 80, 21);
label.frame = CGRectMake(0, 0, self.view.bounds.size.height + 15, 30);
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
NSLog(@"my status bar height is %f", [UIApplication sharedApplication].statusBarFrame.size.height);
NSLog(@"my status bar width is %f", [UIApplication sharedApplication].statusBarFrame.size.width);
newsLabel.frame = CGRectMake((self.view.bounds.size.height - 346) / 2 + 12, self.view.bounds.size.width - 38, 43, 21);
weatherLabel.frame = CGRectMake(newsLabel.frame.origin.x + 64, self.view.bounds.size.width - 38, 42, 21);
sportsLabel.frame = CGRectMake(newsLabel.frame.origin.x + 126, self.view.bounds.size.width - 38, 42, 21);
entertainmentLabel.frame = CGRectMake(newsLabel.frame.origin.x + 185, self.view.bounds.size.width - 38, 66, 21);
videosLabel.frame = CGRectMake(newsLabel.frame.origin.x + 269, self.view.bounds.size.width - 38, 42, 21);
moreLabel.frame = CGRectMake(newsLabel.frame.origin.x + 325, self.view.bounds.size.width - 38, 42, 21);
spacer1.width = (self.view.bounds.size.height - 346) / 2;
spacer2.width = 40;
spacer3.width = 28;
spacer4.width = 42;
spacer5.width = 35;
spacer6.width = 24;
}
-(void) resizeForPortrait
{
newsLabel = (UILabel *)[self.view viewWithTag:50];
weatherLabel = (UILabel *)[self.view viewWithTag:51];
sportsLabel = (UILabel *)[self.view viewWithTag:52];
entertainmentLabel = (UILabel *)[self.view viewWithTag:53];
videosLabel = (UILabel *)[self.view viewWithTag:54];
moreLabel = (UILabel *)[self.view viewWithTag:55];
NSLog(@"resizeForPortrait called");
webView.frame = CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height -88);
button.frame = CGRectMake(0, 0, image.size.width, image.size.height);
myLabel.frame = CGRectMake(145, 152, 80, 21);
label.frame = CGRectMake(0, 0, 315, 40);
NSLog(@"My view frame: %@", NSStringFromCGRect(self.view.bounds));
NSLog(@"my status bar height is %f", [UIApplication sharedApplication].statusBarFrame.size.height);
NSLog(@"my status bar width is %f", [UIApplication sharedApplication].statusBarFrame.size.width);
float myWidth = MIN(self.view.bounds.size.height, self.view.bounds.size.width);
float myHeight = MAX(self.view.bounds.size.height, self.view.bounds.size.width);
newsLabel.frame = CGRectMake(newsLabel.frame.origin.x, myHeight - 18, 43, 21);
weatherLabel.frame = CGRectMake(newsLabel.frame.origin.x + 43, myHeight - 18, 42, 21);
sportsLabel.frame = CGRectMake(newsLabel.frame.origin.x + 97, myHeight - 18, 42, 21);
entertainmentLabel.frame = CGRectMake(newsLabel.frame.origin.x + 138, myHeight - 18, 66, 21);
videosLabel.frame = CGRectMake(newsLabel.frame.origin.x + 213, myHeight - 18, 42, 21);
moreLabel.frame = CGRectMake(newsLabel.frame.origin.x + 258, myHeight - 18, 42, 21);
spacer1.width = (myWidth - 346) / 2;
spacer2.width = 20;
spacer3.width = 18;
spacer4.width = 25;
spacer5.width = 28;
spacer6.width = 14;
}
Called by:
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
[self resizeForLandscape];
} else {
[self resizeForPortrait];
}
}
- (void) getOrientationandResize
{
if (UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation)) {
[self resizeForLandscape];
} else {
[self resizeForPortrait];
}
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self getOrientationandResize];
}
My head is about to explode. Not only are the views reversed, but 20 pixels have been robbed from the width and given to the height. Can anyone explain this to me and how I could/should code the elements in my view to account for it?
My storyboard is as follows:
My initial view:
After first rotation (still good)
Rotating back to portrait (all screwed up because of the bounds values)
You should pretty much never do layout in willRotateToInterfaceOrientation:duration:. When the system sends you willRotateToInterfaceOrientation:duration:, it has not updated your view's frame to its new size. So by consulting self.view.frame, you're using the frame for the current (old) orientation, not the frame for the new (not-yet-rotated-to) orientation.
You should also not do layout in viewDidAppear:, because by the time you receive viewDidAppear:, your view is already on the screen. You need to do layout before your view is on the screen.
You need to do your layout in an appropriate method. The best place to do layout is in the layoutSubviews method of a custom UIView subclass. Putting it there keeps your view logic separate from your controller logic.
The next-best place to do your layout is in the viewWillLayoutSubviews or viewDidLayoutSubviews method of your view controller.
If you put your layout code in layoutSubviews, viewWillLayoutSubviews, or viewDidLayoutSubviews, the system will automatically call that method before your view appears on-screen, and inside the animation block of an autorotation. In both cases, it will update your view's frame for the correct orientation before sending you the message.
If you need to do something like hide a view before the autorotation animation starts, and show it again after, you can do that in willRotateToInterfaceOrientation:duration: and didRotateFromInterfaceOrientation:.
If you want to perform special animations only during an autorotation, and not during initial view layout, you can do that in willAnimateRotationToInterfaceOrientation:duration:, which is called inside the animation block of an autorotation.
You may find this answer helpful: UIViewController returns invalid frame?
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