我在 viewcontroller 的 View 上添加了一个 webview、一个 titleLabel 和一个 coverflowView 作为它的 subview ，我希望它在方向改变时改变大小。我已经用这个方法改变了 webview 的框架:
- (void)willRotateToInterfaceOrientation: (UIInterfaceOrientation)toInterfaceOrientation duration: (NSTimeInterval)duration
如果我以纵向启动应用程序，当将 iPad 从orientationLandscape 旋转到orientationPortrait 或从orientationPortrait 旋转到orientationLandscape 时，它的内容确实会调整大小，但是当我以横向启动应用程序时，它的内容不会调整大小，这太奇怪了。 .但 NSLog 显示框架已更改。至于titleLabel 和coverflowView，它们会正确调整大小。我怀疑是不是因为css？我已经使用css根据webview的高度和宽度来控制内容的样式。有人可以帮我找到原因吗？代码如下:
- (void)willRotateToInterfaceOrientation: (UIInterfaceOrientation)toInterfaceOrientation duration: (NSTimeInterval)duration {
double i = 0;
NSInteger width=self.view.frame.size.width;
NSInteger height=self.view.frame.size.height;
NSLog(@"view :%@",[self.view description]);
switch (toInterfaceOrientation){
case UIInterfaceOrientationPortrait:
{
NSLog(@"rotate to Portrait");
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
self.docView.frame=CGRectMake(0, 50, width+20, height-70);
self.toolbar.frame=CGRectMake(0, 0,height , 50);
for (UIView * view in [toolbar subviews]) {
if ([view isKindOfClass:[UIButton class]] && view.tag==kBackButtonTag){
view.frame=CGRectMake(width-60, 6, 50, 36);
}else if([view isKindOfClass:[UIButton class]] && view.tag==kReloadButtonTag){
view.frame=CGRectMake(width-160, 6, 80,36 );
}
}
[coverflow setFrame:CGRectMake(0, 0 , width+20, height/2-50)];
[titleLabel setFrame:CGRectMake(width/2-40,height/2-100, 100, 20)];
if ([[[UIDevice currentDevice]model]isEqualToString:@"iPad"]) {
self.viewer.frame=CGRectMake(0, 0, 768, 1004);
}else{
self.viewer.frame=CGRectMake(0, 0, 320, 480);
}
}
i=0;
}break;
case UIInterfaceOrientationPortraitUpsideDown:
{
NSLog(@"rotate to PortraitUpsideDown");
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
self.docView.frame=CGRectMake(0, 50, width+20, height-70);
self.toolbar.frame=CGRectMake(0, 0,height , 50);
for (UIView * view in [toolbar subviews]) {
if ([view isKindOfClass:[UIButton class]] && view.tag==kBackButtonTag) {
view.frame=CGRectMake(width-60, 6, 50, 36);
}else if([view isKindOfClass:[UIButton class]] && view.tag==kReloadButtonTag){
view.frame=CGRectMake(width-160, 6, 80,36 );
}
}
[coverflow setFrame:CGRectMake(0, 0 , width+20, height/2-50)];
[titleLabel setFrame:CGRectMake(width/2-40,height/2-100, 100, 20)];
if ([[[UIDevice currentDevice]model]isEqualToString:@"iPad"]) {
self.viewer.frame=CGRectMake(0, 0, 768, 1004);
}else{
self.viewer.frame=CGRectMake(0, 0, 320, 480);
}
}
i=180;
} break;
case UIInterfaceOrientationLandscapeLeft:{
NSLog(@"rotate to LandscapeLeft");
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
// self.coverflow.frame=CGRectMake(0, 0, height+20, width-20);
self.docView.frame=CGRectMake(0, 50, height+20, width-70);
self.toolbar.frame=CGRectMake(0, 0,height+20 , 50);
for (UIView * view in [toolbar subviews]) {
if ([view isKindOfClass:[UIButton class]] && view.tag==kBackButtonTag) {
view.frame=CGRectMake(height-60, 6, 50, 36);
NSLog(@"button %@",[view description]);
}else if([view isKindOfClass:[UIButton class]] && view.tag==kReloadButtonTag){
view.frame=CGRectMake(height-160, 6, 80,36 );
}
}
[coverflow setFrame:CGRectMake(0, 0 , height+20, width/2-50)];
[titleLabel setFrame:CGRectMake(height/2-40,width/2-80, 100, 20)];
if ([[[UIDevice currentDevice]model]isEqualToString:@"iPad"]) {
self.viewer.frame=CGRectMake(0, 0, 1024, 748);
}else{
self.viewer.frame=CGRectMake(0, 0, 480, 320);
}
}
i = 90;
}break;
case UIInterfaceOrientationLandscapeRight:{
NSLog(@"rotate to LandscapeRight");
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
// self.coverflow.frame=CGRectMake(0, 0, height+20, width-20);
self.docView.frame=CGRectMake(0, 50, height+20, width-70);
self.toolbar.frame=CGRectMake(0, 0,height+20 , 50);
for (UIView * view in [toolbar subviews]) {
if ([view isKindOfClass:[UIButton class]] && view.tag==kBackButtonTag) {
view.frame=CGRectMake(height-60, 6, 50, 36);
}
else if([view isKindOfClass:[UIButton class]] && view.tag==kReloadButtonTag){
view.frame=CGRectMake(height-160, 6, 80,36 );
}
}
[coverflow setFrame:CGRectMake(0, 0 , height+20, width/2-50)];
[titleLabel setFrame:CGRectMake(height/2-40,width/2-80, 100, 20)];
if ([[[UIDevice currentDevice]model]isEqualToString:@"iPad"]) {
self.viewer.frame=CGRectMake(0, 0, 1024, 748);
}else{
self.viewer.frame=CGRectMake(0, 0, 480, 320);
}
}
i = -90;
}break;
}
//[webViewController willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
// [self.view setNeedsDisplay];
// NSLog(@"coverflowView :%@",[self.coverflow description]);
NSLog(@"webview :%@",[viewer description]);
[viewer stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"window.__defineGetter__('orientation',function(){return %f;});",i]];
[viewer stringByEvaluatingJavaScriptFromString:@"var e = document.createEvent('Events'); e.initEvent('orientationchange', true, false); document.dispatchEvent(e); "];
}
- (void)viewDidLoad {
self.view.clipsToBounds=YES;
self.view.autoresizesSubviews=YES;
// self.view.autoresizingMask=UIViewAutoresizingNone;
viewer=[[UIWebView alloc]initWithFrame:self.view.bounds];
[self.view addSubview:viewer];
viewer.delegate=self;
viewer.scalesPageToFit=NO;
viewer.autoresizesSubviews=NO;
viewer.autoresizingMask=UIViewAutoresizingNone;
viewer.dataDetectorTypes=0;
// viewer.autoresizingMask=UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
NSLog(@"webView :%@",[viewer description]);
// [viewer setFrame:CGRectMake(0, self.view.bounds.size.height/2 , self.view.bounds.size.width, self.view.bounds.size.height/2)];
// [viewer setBounds:CGRectMake(0, self.view.bounds.size.height/2 , self.view.bounds.size.width, self.view.bounds.size.height/2)];
UIScrollView *scroller=[viewer.subviews objectAtIndex: 0];
if (scroller) {
scroller.alwaysBounceVertical=NO;
scroller.bounces=NO;
scroller.scrollEnabled=NO;
}
[self viewHomePage];
//[self createCoverFlowView];
[self createPopView];
//[self setHomeButtonPosition];
//[self setSettingButtonPosition];
#if __IPHONE_OS_VERSION_MIN_REQUIRED > 30000
UILongPressGestureRecognizer* longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
[self.view addGestureRecognizer:longPress];
longPress.minimumPressDuration=2.0;
longPress.delegate = self;
longPress.cancelsTouchesInView = NO;
longPress.allowableMovement=20;
[longPress release];
UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
[self.view addGestureRecognizer:singleTap];
singleTap.delegate = self;
singleTap.cancelsTouchesInView = NO;
[singleTap release];
#endif
//[viewer setOpaque:YES]; //透明
[super viewDidLoad];
}
最佳答案
我花了大约两天时间试图找出这个问题，因为我遇到了完全相同的问题。我发现如果我的 View 以纵向模式开始，它会正确调整为横向。但是，如果我在横向模式下启动 View ，它会在纵向模式下保持相同的大小。
如果您的 View 是设备的整个宽度，只需添加以下元标记即可。
<meta name="viewport" content="width=device-width" />
但是，就我而言，我们的 UIWebView 是非标准尺寸。将视口(viewport)设置为 device-width 只会让情况变得更糟!通过使用javascript动态设置视口(viewport)，我能够让一切正常工作。这应该在 UIWebViews 父 View 的 layoutSubviews 期间完成。您可以在 willRotateToInterfaceOrientation 中执行此操作，但我发现如果您在 willRotate 中执行此操作，某些尺寸和接口(interface)可能设置不正确。先在那里尝试一下，看看动画是如何工作的。
代码只是将视口(viewport)大小设置为当前帧大小。您正在查看的 HTML 必须已经有一个 meta viewport 标记(如上)。如果您无法编辑 HTML，还有其他方法可以通过 javascript 添加它。最简单的方法是将元标记添加到 标记中。然后使用以下代码，正确设置框架后:
// assuming your self.viewer is a UIWebView
[self.viewer stringByEvaluatingJavaScriptFromString:
[NSString stringWithFormat:
@"document.querySelector('meta[name=viewport]').setAttribute('content', 'width=%d;', false); ",
(int)self.viewer.frame.size.width]];
如果您不希望用户进行缩放，或者您想设置最大比例，您可以添加其他视口(viewport)项。这最终使我们的 UIWebView 的 View 行为正确。
关于objective-c - UIWebView 在方向改变时没有正确调整大小？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6007904/