ios:<错误>:CGAffineTransformInvert:奇异矩阵
<p><p>出现此错误“CGAffineTransformInvert”的任何原因</p>
<p>我应该担心吗？</p>
<p>我有一个带有 View 的 .xib，还有 4 个 webViews 位于 View 之外但在同一个 xib 中。然后在代码中，我将 webViews 作为 subview 添加到 View 内的 ScrollView 中。这会导致问题吗？</p>
<p>代码如下:</p>
<pre><code>//Called first to initializethis class. Also, initializes the nib file and tab bar name.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = ;
if (self) {
self.title = NSLocalizedString(@"More", @"More");
self.tabBarItem.image = ;
}
return self;
}
//Initialize the more tab titles and views
-(void)initViewsandTitles{
MoreTabPages = [NSArray arrayWithObjects:self.aboutWebView,
self.newsUpdateWebView,
self.feedbackWebView,
self.creditsResourceWebView, nil];
titles = [ initWithObjects:@"About Locavore",
@"News and Updates",
@"Feedback",
@"Credits and Resources", nil];
}
//Initialize the URLs
-(void)initURLs{
websites = [ initWithObjects:@"http://www.getlocavore.com/",
@"http://twitter.com/enjoy_locavore",
@"https://getsatisfaction.com/localdirt/products/localdirt_locavore",
@"http://www.getlocavore.com/about", nil];
}
//Called after the controller's view is loaded into memory.
- (void)viewDidLoad
{
; //Call the super class init method
; //Start the spinner animatio
; //Initialize the views and titles
; //Initialize the URLs
;//Set the scroll and page view properties
; //Create the web pages
}
//UIScrollViewDelegate Protocol Reference. Called whn the user scrolls the content within the reciever
- (void)scrollViewDidScroll:(UIScrollView *)sender {
if (!pageControlBeingUsed) {
// Switch the indicator when more than 50% of the previous/next page is visible
CGFloat pageWidth = self.MoreTabScrollView.frame.size.width;
int page = floor((self.MoreTabScrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
self.MoreTabPageControl.currentPage = page;
self.MoreTabTitle.text = ;
}
}
//UIScrollViewDelegate Protocol Reference. Called when the scroll view is about to start scolling content
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
pageControlBeingUsed = NO;
}
//UIScrollViewDelegate Protocol Reference. Called when the scroll view has ended decelerating the scrolling movement
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
NSLog(@"DID END SCROLLING");
pageControlBeingUsed = NO;
}
//Called when the page control value changes
- (IBAction)MoreTabChangePage {
// Update the scroll view to the appropriate page
CGRect frame;
frame.origin.x = self.MoreTabScrollView.frame.size.width * self.MoreTabPageControl.currentPage;
frame.origin.y = 0;
frame.size = self.MoreTabScrollView.frame.size;
;
self.MoreTabTitle.text = ;
// Keep track of when scrolls happen in response to the page control
// value changing. If we don't do this, a noticeable "flashing" occurs
// as the the scroll delegate will temporarily switch back the page
// number.
pageControlBeingUsed=YES;
}
//Create a frame for each page and add the page to the scroll view
-(void)setUpPageViews{
//Set up all page views for the more tab
for (int i = 0; i < MoreTabPages.count; i++) {
//Get the current table view controller page
UIWebView *webController= ;
//Request the URL and load the request
NSURL *urll =];
//Run requests in seperate thread
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
dispatch_async(queue, ^{
NSURLRequest *firstReq = ;
;
dispatch_sync(dispatch_get_main_queue(), ^{
//Create a frame for the current table view controller
CGRect frame = webController.frame;
frame.origin.x = self.MoreTabScrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.MoreTabScrollView.frame.size;
webController.frame = frame;
//Add the the current table view controller page to the scroll view
;
//Release the controller object it is no longer needed
;
if(i == 3){
;
}
});
});
}
}
//Set al the properties for the scroll view and page controll
-(void)setScrollandPageViewProperties{
self.MoreTabScrollView.contentSize = CGSizeMake(self.MoreTabScrollView.frame.size.width * MoreTabPages.count,
self.MoreTabScrollView.frame.size.height);
self.MoreTabScrollView.scrollsToTop = NO;
self.MoreTabScrollView.contentOffset = CGPointMake(self.MoreTabScrollView.frame.size.width, 0);
self.MoreTabPageControl.numberOfPages = MoreTabPages.count;
}
-(void)setupSpinner{
spinner.hidesWhenStopped = YES;
;
}
//Called if the application receives a memory warning
- (void)didReceiveMemoryWarning
{
;
// Dispose of any resources that can be recreated.
}
//Called when the UIViewController's reference count goes to zero
- (void)dealloc {
;
;
;
;
;
;
;
;
}
@end
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>尝试为每个 webview 设置最小缩放比例。</p>
<blockquote>
<pre><code>
</code></pre>
</blockquote>
<p>如果 ScrollView 在零缩放时达到零，它会抛出同样的错误。</p></p>
<p style="font-size: 20px;">关于ios:<错误>:CGAffineTransformInvert:奇异矩阵，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/17499645/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/17499645/
</a>
</p>
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