Iphone 惰性TableView图像加载Malloc错误
我试图将图像延迟加载到我的tableview中,但是当我尝试将一个特定图像插入到图像数组中时,我得到了一个双重自由malloc错误 这是错误:Flags8079,0xa0258540 malloc:*对象0x6a51b40的错误:双重自由 *在malloc\u error\u break中设置断点以进行调试 这是我的密码:Iphone 惰性TableView图像加载Malloc错误,iphone,objective-c,Iphone,Objective C,我试图将图像延迟加载到我的tableview中,但是当我尝试将一个特定图像插入到图像数组中时,我得到了一个双重自由malloc错误 这是错误:Flags8079,0xa0258540 malloc:*对象0x6a51b40的错误:双重自由 *在malloc\u error\u break中设置断点以进行调试 这是我的密码: #import "ViewController.h" #import "ASync.h" @implementation ViewController @synthesiz
#import "ViewController.h"
#import "ASync.h"
@implementation ViewController
@synthesize tableView;
@synthesize countryNamesArray;
@synthesize receivedData;
@synthesize flagImage;
@synthesize flagImagesArray;
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
-(void)issueRequest:(NSString *)fullCountryImageURL{
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:fullCountryImageURL]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// create the connection with the request
// and start loading the data
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection) {
// Create the NSMutableData to hold the received data.
// receivedData is an instance variable declared elsewhere.
receivedData = [NSMutableData data];
}
else {
// Inform the user that the connection failed.
}
}
- (void)viewDidLoad
{
flagImagesArray = [[NSMutableArray alloc]init];
for(int x=0; x<16; x++){
[flagImagesArray insertObject:[UIImage imageNamed: @"jollyroger_poisonflag.jpg"] atIndex:x];
}
countryNamesArray=[[NSArray alloc] initWithObjects:@"India",@"USA",@"Antarctica",@"Brazil",@"Canada",@"China",@"France",@"Germany",@"Italy",@"Japan",@"Kenya",@"Malaysia",@"Mexico",@"South Africa",@"United Kingdom",@"Vietnam",nil];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
-(NSInteger)tableView:(UITableView *)tableview numberOfRowsInSection:(NSInteger)section{
return 16;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// This method is called when the server has determined that it
// has enough information to create the NSURLResponse.
// It can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.
// receivedData is an instance variable declared elsewhere.
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the new data to receivedData.
// receivedData is an instance variable declared elsewhere.
[receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connectiondidFailWithError:(NSError *)error
{
// release the connection, and the data object
// receivedData is declared as a method instance elsewhere
// inform the user
NSLog(@"Connection failed! Error - %@ %@",
[error localizedDescription],
[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// do something with the data
// receivedData is declared as a method instance elsewhere
NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]);
flagImage = [UIImage imageWithData: receivedData];
if([receivedData length]==19935){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==0)
[flagImagesArray replaceObjectAtIndex:0 withObject:flagImage];
}
}
else if([receivedData length]==9280){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==1)
[flagImagesArray replaceObjectAtIndex:1 withObject:flagImage];
}
}
else if([receivedData length]==9567){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==2)
[flagImagesArray replaceObjectAtIndex:2 withObject:flagImage];
}
}
else if([receivedData length]==12152){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==3)
[flagImagesArray replaceObjectAtIndex:3 withObject:flagImage];
}
}
else if([receivedData length]==10903){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==4)
[flagImagesArray replaceObjectAtIndex:4 withObject:flagImage];
}
}
else if([receivedData length]==11298){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==5)
[flagImagesArray replaceObjectAtIndex:5 withObject:flagImage];
}
}
else if([receivedData length]==8682){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==6)
[flagImagesArray replaceObjectAtIndex:6 withObject:flagImage];
}
}
else if([receivedData length]==6865){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==7)
[flagImagesArray replaceObjectAtIndex:7 withObject:flagImage];
}
}
else if([receivedData length]==10567){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==8)
[flagImagesArray replaceObjectAtIndex:8 withObject:flagImage];
}
}
else if([receivedData length]==9423){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==9)
[flagImagesArray replaceObjectAtIndex:9 withObject:flagImage];
}
}
else if([receivedData length]==820){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==10)
**[flagImagesArray replaceObjectAtIndex:10 withObject:flagImage];**
}
}
else if([receivedData length]==12238){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==11)
[flagImagesArray replaceObjectAtIndex:11 withObject:flagImage];
}
}
else if([receivedData length]==5980){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==12)
[flagImagesArray replaceObjectAtIndex:12 withObject:flagImage];
}
}
else if([receivedData length]==10562){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==13)
[flagImagesArray replaceObjectAtIndex:13 withObject:flagImage];
}
}
else if([receivedData length]==9690){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==14)
[flagImagesArray replaceObjectAtIndex:14 withObject:flagImage];
}
}
else if([receivedData length]==11590){
for (NSIndexPath *indexPath in [tableView indexPathsForVisibleRows]){
if(indexPath.row==15)
[flagImagesArray replaceObjectAtIndex:15 withObject:flagImage];
}
}
[tableView reloadData];
}
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIdentifier = @"countryCell";
static int numberOfRequests=0;
UITableViewCell *cell=(UITableViewCell *) [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell==nil){
cell=[[UITableViewCell alloc] initWithStyle: UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
}
// Create the request.
NSString *flagImageURLPartOne = @"http://www.imageslink/";
NSString *countryNumber = [NSString stringWithFormat:@"%i", indexPath.row];
NSString *flagImageURLPartTwo = @".png";
NSString *fullCountryImageURL = [NSString stringWithFormat:@"%@%@%@", flagImageURLPartOne, countryNumber, flagImageURLPartTwo];
[self issueRequest:fullCountryImageURL];
numberOfRequests++;
cell.imageView.image=[flagImagesArray objectAtIndex:indexPath.row];
cell.textLabel.text= [countryNamesArray objectAtIndex:indexPath.row];
return cell;
}
-(void) tableView:(UITableView *) tableview didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
}
@end
引发错误的行以粗体显示-它位于代码行:[flagImagesArray replaceObjectAtIndex:10 withObject:flagImage];。当我将这行注释掉时,所有其他图像都会加载良好。有人知道问题是什么吗?转到“断点”选项卡,在左下角单击“添加”按钮,选择“添加异常断点”,然后单击“完成”
再次运行代码,您将准确地找到崩溃发生的时间和地点,以及所有调试信息,只是为了完成 问题很可能出在图像上。图像可能已损坏。使用820支架内的断点将告诉我们错误发生的位置 在这种情况下。我总是建议对数据进行计数,以确定从服务器传输的数据 约翰解决了这个问题。问题是 我有一个链接是拉在一个网页没有找到,而不是一个图像
我看不到粗线条。你是说这个吗?[FlagImagesRay replaceObjectAtIndex:10 with Object:flagImage];对我不知道该怎么大胆。它所做的只是在它的周围加上星号。因为它在一个代码中,这可能就是原因。你能输入你收到的错误吗?我建议先检查长度,然后再检查你得到的820的图像。可能存在图像损坏。可以启用僵尸并查看发生了什么吗?因此,我可以通过更改以下行来修复崩溃:NSString*countryNumber=[NSString stringWithFormat:@%I,indexPath.row];至NSString*countryNumber=[NSString stringWithFormat:@%i,indexPath.row+1]。很明显,我根本没有发送这个图像的请求。但是,现在发生的情况是图像从未加载。一个占位符就留在那里。考虑到所有其他图像的加载都很好,并且问题图像的链接也很好,这是很奇怪的。