我正试图在iOS应用中制作Facebook / 9gag评论页面。简而言之，列表视图中会有一个图像列表，并且有一个评论按钮，当用户按下它时，评论列表视图将像Facebook和9gag中的那样显示。
在我的项目中，我创建了几个实现此目的的类，它们是：
以下是有关该问题的代码段：
首先，当用户按下其中一个MyPhotoCell中的注释按钮时，它将调用CommentListViewController的创建：
//MyPhotoCell.m
- (void)click_btn_comment:(id)sender
{
CommentViewController *comment_view = [[CommentViewController alloc] initWithNibName:@"CommentViewController" bundle:nil];
comment_view.targetPhotoid = self.photoItem.photoid;
[[MyAppCoreData coreData].navController pushViewController:comment_view animated:YES];
}
以下：
//CommentViewController.h
@property (assign, nonatomic) NSInteger targetPhotoid;
@property (strong, nonatomic) NSMutableArray *arr_commentList;
//CommentViewController.m
@interface SecondCreation_CommentViewController ()<UITableViewDataSource, UITableViewDelegate>
{
ASIHTTPRequest *request_comment;
}
@property (strong, nonatomic) UITableView *tbl_comment;
@property (strong, nonatomic) NSNumber *page;
@end
- (void)viewWillAppear:(BOOL)animated
{
if(!self.tbl_comment){
self.tbl_comment = [[UITableView alloc] init];
self.tbl_comment.delegate = self;
self.tbl_comment.dataSource = self;
self.tbl_comment.frame = CGRectMake(0, 55, PHOTOWIDTH, SCREEN_HEIGHT - 100);
[self.view addSubview:self.tbl_comment];
}
if([NSArray checkEmptyArray:self.arr_commentList]){
self.page = 0;
[self sendRequest:1];
}
}
- (void)addDisplayData:(NSArray *)arr_addData withReset:(BOOL)reset
{
//NSLog here shows arr_addData has a count of 6 (6 comments inside, which is normal)
//NSLog here shows arr_commentList has a count of 0 (which is also expected)
if (reset) {
[self.arr_commentList removeAllObjects];
}else {
if (!self.arr_commentList) {
self.arr_commentList = [NSMutableArray array];
}
}
[self.arr_commentList addObjectsFromArray:arr_addData];
//NSLog here shows arr_addData still has a count of 6
//NSLog here shows arr_commentList has a count of 6
}
- (void)sendRequest:(NSInteger)page
{
__block typeof(self)blockSelf = self;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
blockSelf -> request_comment = [APIOperator getCommentListForPhoto:@(self.targetPhotoid) andPage:page WithCompletionHandler:^(APISTATUS apiStatus, CommentListItem *commentListItem, ASIHTTPRequest *request) {
if (request != blockSelf -> request_comment) {
return;
}
dispatch_async(dispatch_get_main_queue(), ^(void) {
if (apiStatus == APISTATUS_SUCCESS) {
//I tried to access and print out the content of the returned commentList here, and it gives EXC_BAD_ACCESS (code = 1 ......)
//e.g. NSLog(((CommentItem *)[commentListItem.commentList objectAtIndex:0]).message);
//I tried to assign the returned commentList to my controller through various ways like:
//[blockSelf.arr_commentList addObjectsFromArray:commentListItem.commentList];
//[blockSelf.arrcommentList = commentListItem.commentList;
//[blockSelf addDisplayData:commentListItem.commentList withReset:YES];
//I tried to access the content of controller's arr_commentList, it will give EXC_BAD_ACCESS (code = 1, .....) too
} else {
}
});
}];
});
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *identifier = @"commentcell";
CommentCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if(!cell)
cell = [[CommentCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
//acessing the local arr_commentList here will also gives EXC_BAD_ACCESS (code = 1.....)
return cell;
}
最后，发出api请求的APIOperator类（ASIHTTPREQUEST是一个包装类，用于向服务器发送HTTP请求并与RESTFUL api交互，链接：link here）：
//APIOperator.m
+ (ASIHTTPRequest *)getCommentListForPhoto:(NSNumber *)photoid andPage:(NSInteger)page WithCompletionHandler:(void(^)(APISTATUS apiStatus, CommentListItem *apiItem, ASIHTTPRequest *request))completionBlock
{
NSString *str_page = [NSString stringWithFormat:@"%@", @(page)];
//API_URL here is the url to call the api in the server
NSString *str_API = [NSString stringWithFormat:@"%@",API_URL];
ASIHTTPRequest *_request = [ASIHTTPRequest createAPIRequest:str_API];
__block ASIHTTPRequest *request = _request;
__block void(^tempBlock)(APISTATUS apiStatus, CommentListItem *apiItem, ASIHTTPRequest *request) = completionBlock;
[_request setCompletionBlock:^{
if ([request responseStatusCode] == 200 || [request responseStatusCode] == 302 || [request responseStatusCode] == 304) {
DEBUGMSG(@"%d %@",[request responseStatusCode], request.url)
JSONParse *jsonParse = [[JSONParse alloc] initWithData:[request responseData]];
CommentListItem *obj = (CommentListItem *)[jsonParse parser2OneObject:@"CommentListItem" withPath:nil];
//I tried to print out the contents of the comments here, and everything are as expected
NSLog(((CommentItem *)[obj.commentList objectAtIndex:0]).message);
jsonParse = nil;
if (tempBlock) {
tempBlock(APISTATUS_SUCCESS,obj,request);
}
tempBlock = nil;
request = nil;
} else {
DEBUGMSG(@"%d %@",[request responseStatusCode], request.url)
if (tempBlock) {
tempBlock(apiStatus,nil,request);
}
tempBlock = nil;
request = nil;
}
}];
[_request setFailedBlock:^{
DEBUGMSG(@"%d %@",[request responseStatusCode], request.url)
if (tempBlock) {
tempBlock(apiStatus,nil,request);
}
tempBlock = nil;
request = nil;
}];
[_request performSelector:@selector(startAsynchronous)];
return _request;
}
我在互联网上搜索并发现EXC_BAD_ACCESS代码= 1是关于访问/释放之前已经释放/解除分配的变量，但我仍然无法弄清楚这里的问题。我无法找到它被释放/解除分配的位置，以及为什么它如果被释放/解除分配仍然给我6分。希望我能在这里得到一些帮助，了解导致这个问题的原因以及如何解决这个问题，因为我已经解决了这个问题很长一段时间，但仍然不知道问题是什么以及该怎么做。非常感谢！