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我有一个UIWebView的UIViewController子类。它增加了Web视图，因为它的视图子视图和dealloc释放它。以下是相关代码：UIWebView发布导致崩溃
#import "MediaVC.h"
@implementation MediaVC
@synthesize file, repository, server, delegate;
- (void)viewDidLoad {
[super viewDidLoad];
webView = [[UIWebView alloc] initWithFrame:[[self view] bounds]];
[webView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)];
[webView setScalesPageToFit:YES];
[webView setMultipleTouchEnabled:YES];
[[self view] addSubview:webView];
[self displayFile];
[flex release];
[buttonDone release];
[buttonAction release];
}
- (void)displayFile {
if (!mimeString) {
[webView loadData:nil
MIMEType:nil
textEncodingName:nil
baseURL:nil];
[SVProgressHUD dismissWithError:@"Can't display this file." afterDelay:2];
} else {
[[DataCenter sharedInstance] getDataForFile:file
server:server
repository:repository
isThumb:NO
completion:^(NSData *data) {
NSString *filenamePath =[NSString stringWithFormat:@"temp.%@", [[file path] pathExtension]];
NSString *docDir = [DataCenter getDocumentsDirectoryPath];
NSString *fullPath = [docDir stringByAppendingPathComponent:filenamePath];
[data writeToFile:fullPath atomically:YES];
[webView loadData:data
MIMEType:[DataCenter mimeTypeForFile:file]
textEncodingName:nil
baseURL:nil];
if (!data) {
[SVProgressHUD dismissWithError:@"Error!"];
} else {
[SVProgressHUD dismiss];
}
} progress:^(float progress) {
[SVProgressHUD setFloat:progress];
}];
}
}
- (void)dealloc {
[buttonNext release];
[buttonBack release];
//[webView release]; ---CRASH HAPPENS IF I UNCOMMENT THIS LINE
[super dealloc];
}
@end
该应用程序在[super dealloc];上崩溃。我有NSZombieEnabled，它不会给我任何有关“错误发送到释放实例....”的错误。我发现的是，如果我注释掉[webView release],，崩溃不会发生。 我检查，我只分配一次UIWebView并释放一次。
UPDATE请在下面找到完整的课程。正如我所说，有很多在这个类，这不是相关的，在这我找不到任何问题，也许你们找到的东西：
#import "MediaVC.h"
#import "DataCenter.h"
#import "SVProgressHUD.h"
#import "File.h"
@implementation MediaVC
@synthesize file, repository, server, delegate;
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *buttonDone = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
target:self
action:@selector(done)];
UIBarButtonItem *buttonAction = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
target:self
action:@selector(action:)];
buttonNext = [[UIBarButtonItem alloc] initWithTitle:@"Next"
style:UIBarButtonItemStyleDone
target:self
action:@selector(next)];
buttonBack = [[UIBarButtonItem alloc] initWithTitle:@"Back"
style:UIBarButtonItemStyleDone
target:self
action:@selector(back)];
UIBarButtonItem *flex = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:nil
action:nil];
[[self navigationItem] setLeftBarButtonItem:buttonDone];
[[self navigationItem] setRightBarButtonItem:buttonAction];
[[self navigationController] setToolbarHidden:NO];
[self setToolbarItems:[NSArray arrayWithObjects:buttonBack, flex, buttonNext, nil] animated:YES];
webView = [[UIWebView alloc] initWithFrame:[[self view] bounds]];
[webView setAutoresizingMask:(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)];
[webView setScalesPageToFit:YES];
[webView setMultipleTouchEnabled:YES];
[[self view] addSubview:webView];
[self displayFile];
[flex release];
[buttonDone release];
[buttonAction release];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
- (void)done {
[delegate doneMediaVC:self];
}
- (void)action:(id)button {
NSString *filenamePath = [file path];
NSString *docDir = [DataCenter getDocumentsDirectoryPath];
NSString *fullPath = [docDir stringByAppendingPathComponent:filenamePath];
NSURL *url = [NSURL fileURLWithPath:fullPath];
UIDocumentInteractionController *c = [UIDocumentInteractionController interactionControllerWithURL:url];
BOOL success = [c presentOpenInMenuFromBarButtonItem:buttonBack animated:YES];
if (!success) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"An application cannt be found to open this file"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil, nil];
[alertView show];
[alertView release];
}
}
- (void)displayFile {
[self setTitle:[file name]];
[SVProgressHUD showInView:[[self navigationController] view]
status:@"Loading..."
networkIndicator:YES
progress:YES];
NSString *mimeString = [DataCenter mimeTypeForFile:file];
if (!mimeString) {
[webView loadData:nil
MIMEType:nil
textEncodingName:nil
baseURL:nil];
[SVProgressHUD dismissWithError:@"Can't display this file." afterDelay:2];
} else {
[[DataCenter sharedInstance] getDataForFile:file
server:server
repository:repository
isThumb:NO
completion:^(NSData *data) {
NSString *filenamePath =[NSString stringWithFormat:@"temp.%@", [[file path] pathExtension]];
NSString *docDir = [DataCenter getDocumentsDirectoryPath];
NSString *fullPath = [docDir stringByAppendingPathComponent:filenamePath];
[data writeToFile:fullPath atomically:YES];
[webView loadData:data
MIMEType:[DataCenter mimeTypeForFile:file]
textEncodingName:nil
baseURL:nil];
if (!data) {
[SVProgressHUD dismissWithError:@"Error!"];
} else {
[SVProgressHUD dismiss];
}
} progress:^(float progress) {
[SVProgressHUD setFloat:progress];
}];
}
if (![delegate canGoNext:self currentFile:file]) {
[buttonNext setEnabled:NO];
} else {
[buttonNext setEnabled:YES];
}
if (![delegate canGoPrevious:self currentFile:file]) {
[buttonBack setEnabled:NO];
} else {
[buttonBack setEnabled:YES];
}
}
- (void)back {
[self setFile:[delegate getPreviousFileForMediaVC:self currentFile:file]];
[self displayFile];
}
- (void)next {
[self setFile:[delegate getNextFileForMediaVC:self currentFile:file]];
[self displayFile];
}
- (void)dealloc {
[buttonNext release];
[buttonBack release];
//[webView release];
[super dealloc];
}
@end
谢谢！
webview变量的分配和释放没有任何问题。也许你创建了一个映射到webview的保留属性？如果没有，其他的事情一定会导致事故。 – 2012-03-19 18:35:18
@PhilippeLeybaert查看缺少的代码量，实际代码很多可能是错误的。 – mvds 2012-03-19 18:44:55
我知道，这就是为什么我说这个变量的alloc/release没有问题，而其他的可能会导致这个问题。 – 2012-03-19 18:48:58