UITableView崩溃没有错误 [英] UITableView crashing with no erros

问题描述

基本上，从导航控制器的根，一个表视图，我构建一个URL字符串，其中包含我想显示在新的tableView的信息。在新表视图中，我使用NSURL请求的URL。我的代码给我没有错误，但崩溃，紧接着NSLog：made细胞。帮助之前我杀了自己。抱歉应该都在一起，但复制粘贴代码显然不能很好地工作。

  #importCatDisplayViewController.h
 #importCatViewController.h
 
 
实现CatDisplayViewController 
 
 @synthesize downvotebutton; 
 @synthesize upvotebutton; 
 // @ synthesize tripsHold; 
 @synthesize URLtoUse; 
 
 
 
 
 
 
 NSArray * trips; 
 
 
  - （void）viewDidLoad {
 [super viewDidLoad]; 
 
 
 
 NSURL * url = [NSURL URLWithString：URLtoUse]; 
 
 NSLog（@％@，url）; 
 
 responseData = [[NSMutableData data] retain]; 
 
 NSURLRequest * request = [NSURLRequest requestWithURL：url]; 
 [[NSURLConnection alloc] initWithRequest：request delegate：self]; 
  

}

   - （void）connection：（NSURLConnection *）connection didReceiveResponse：（NSURLResponse *）response {
 NSLog（@recieved response）; 
 [responseData setLength：0]; 
  

}

   - （void）connection：（NSURLConnection *）connection didReceiveData：（NSData *）data {
 NSLog（@Did receiveieve）; 
 [responseData appendData：data]; 
  

}

   - （void）connection：（NSURLConnection *）connection didFailWithError：（NSError *）error {
 NSLog（@connection failed）; 
 NSLog（@％@，error）; 
  

}

   - （void）connectionDidFinishLoading：（NSURLConnection *）connection {
 [connection release]; 
 NSLog（@我们的连接完成加载）; 
 NSString * responseString = [[NSString alloc] initWithData：responseData encoding：NSUTF8StringEncoding]; 
 [responseData release]; 
 
 NSLog（@％@，responseString）; 
 
 NSLog（@released data）; 
 NSDictionary * results = [responseString JSONValue]; 
 NSLog（@built JSON dictionary）; 
 NSArray * allTrips = [results objectForKey：@results]; 
 NSLog（@built dictionary from dictionary）; 
 
 trips = allTrips; 
 NSLog（@done with connectFinish method）; 
 
 [self.tableView reloadData]; 
  

}

  #pragma mark  -  
 #pragma mark表视图数据源
 
 
 
  - （NSInteger）numberOfSectionsInTableView：（UITableView *）tableView {
 //返回节的数量。 
 
 NSLog（@in sections number）; 
 
 return 1; 
  

}

   - （NSInteger）tableView：（UITableView *）tableView numberOfRowsInSection：（NSInteger）section {
 //返回节中的行数。 
 NSLog（@％@，trips）; 
 return [trips count]; 
  

}

   - （CGFloat）tableView：（UITableView *）tableView heightForRowAtIndexPath：（NSIndexPath *）indexPath 
 {
 NSLog（@in height for row）; 
 return 80; 
} 
 
 
 //自定义表视图单元格的外观。 
  - （UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath {
 NSLog（@Trying to build table）; 
 static NSString * CellIdentifier = @Cell; 
 
 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier：CellIdentifier]; 
 if（cell == nil）{
 cell = [[[UITableViewCell alloc] initWithStyle：UITableViewCellStyleSubtitle reuseIdentifier：CellIdentifier] autorelease]; 
} 
 
 //配置单元格... 
 NSLog（@made cell）; 
 
 NSDictionary * trip = [trips objectAtIndex：[indexPath row]]; 
 
 NSLog（@from dictionary）; 
 
 cell.textLabel.text = [trip objectForKey：@txt]; 
 cell.textLabel.adjustsFontSizeToFitWidth = YES; 
 cell.textLabel.font = [UIFont systemFontOfSize：12]; 
 cell.textLabel.minimumFontSize = 10; 
 cell.textLabel.numberOfLines = 4; 
 cell.textLabel.lineBreakMode = UILineBreakModeWordWrap; 
 
 cell.detailTextLabel.text = [trip objectForKey：@name]; 
 
 UIButton * upvote = [UIButton buttonWithType：UIButtonTypeRoundedRect]; 
 
 UIImage * upVoteBack = [UIImage imageNamed：@arrowup.png]; 
 [upvote setBackgroundImage：upVoteBack forState：UIControlStateNormal]; 
 [upvote setTitle：@+forState：UIControlStateNormal]; 
 upvote.frame = CGRectMake（250.0f，40.0f，25.0f，25.0f）; 
 [upvote addTarget：self action：@selector（upvoteaction：）forControlEvents：UIControlEventTouchUpInside]; 
 [cell addSubview：upvote]; 
 
 UIButton * downvote = [UIButton buttonWithType：UIButtonTypeRoundedRect]; 
 UIImage * downVoteBack = [UIImage imageNamed：@arrowdown.png]; 
 [upvote setBackgroundImage：downVoteBack forState：UIControlStateNormal]; 
 [downvote setTitle：@ - forState：UIControlStateNormal]; 
 downvote.frame = CGRectMake（250.0f，40.0f，25.0f，25.0f）; 
 [downvote addTarget：self action：@selector（downvoteaction：）forControlEvents：UIControlEventTouchUpInside]; 
 [cell addSubview：downvote]; 
 
 
 
 // NSURL * url = [NSURL URLWithString：[aTweet objectForKey：@profile_image_url]]; 
 // NSData * data = [NSData dataWithContentsOfURL：url]; 
 //cell.imageView.image = [UIImage imageWithData：data]; 
 cell.selectionStyle = UITableViewCellSelectionStyleNone; 
 return cell; 
  

}

解决方案

  trips = [allTrips retain]; 
  

您的旅行数组正在自动释放 - 请尝试保留并确认是否仍然收到错误。 p>

Basically, from the root of the navigation controller, a table view, I build a URL string that contains the information i want to display on the new tableView. in the new table view i use the URL for an NSURL request. My code gives me no error but crashes, right after the NSLog: made cells. help before i kill myself. sorry should all be together but copy pasting code obviously doesn't work well.

#import "CatDisplayViewController.h"
#import "CatViewController.h"


implementation CatDisplayViewController

@synthesize downvotebutton;
@synthesize upvotebutton;
//@synthesize tripsHold;
@synthesize URLtoUse;






NSArray *trips;


- (void)viewDidLoad {
[super viewDidLoad];



NSURL *url = [NSURL URLWithString:URLtoUse];

NSLog(@"%@", url);

responseData = [[NSMutableData data] retain];

NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(@" recieved response ");
[responseData setLength:0];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSLog(@" Did recieve data ");
[responseData appendData:data];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@" connection failed ");
NSLog(@"%@", error);

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
NSLog(@" our connect finished loading");
NSString *responseString = [[NSString alloc] initWithData:responseData     encoding:NSUTF8StringEncoding];
[responseData release];

NSLog(@"%@", responseString);

NSLog(@" released data ");
NSDictionary *results = [responseString JSONValue];
NSLog(@" built JSON dictionary ");
NSArray *allTrips = [results objectForKey:@"results"];
NSLog(@" built array from dictionary ");

trips = allTrips;
NSLog(@" done with connectFinish method ");

[self.tableView reloadData];

}

#pragma mark -
#pragma mark Table view data source



- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.

NSLog(@" in sections number ");

return 1;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
NSLog(@"%@", trips);
return [trips count];

}

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
   NSLog(@" in height for row ");
return 80;
}


// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@" Trying to build table ");
static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}

// Configure the cell...
NSLog(@"made cells");

NSDictionary *trip = [trips objectAtIndex:[indexPath row]];

NSLog(@" made dictionary from array ");

cell.textLabel.text = [trip objectForKey:@"txt"];
cell.textLabel.adjustsFontSizeToFitWidth = YES;
cell.textLabel.font = [UIFont systemFontOfSize:12];
cell.textLabel.minimumFontSize = 10;
cell.textLabel.numberOfLines = 4;
cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;

cell.detailTextLabel.text = [trip objectForKey:@"name"];

UIButton *upvote =[UIButton buttonWithType:UIButtonTypeRoundedRect];

UIImage *upVoteBack = [UIImage imageNamed:@"arrowup.png"];
[upvote setBackgroundImage:upVoteBack forState:UIControlStateNormal];
[upvote setTitle:@"+" forState:UIControlStateNormal];
upvote.frame = CGRectMake(250.0f, 40.0f, 25.0f, 25.0f);
[upvote addTarget:self action:@selector(upvoteaction:)forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:upvote];

UIButton *downvote =[UIButton buttonWithType:UIButtonTypeRoundedRect];
UIImage *downVoteBack = [UIImage imageNamed:@"arrowdown.png"];
[upvote setBackgroundImage:downVoteBack forState:UIControlStateNormal];
[downvote setTitle:@"-" forState:UIControlStateNormal];
downvote.frame = CGRectMake(250.0f, 40.0f, 25.0f, 25.0f);
[downvote addTarget:self action:@selector(downvoteaction:)forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:downvote];



//NSURL *url = [NSURL URLWithString:[aTweet objectForKey:@"profile_image_url"]];
//NSData *data = [NSData dataWithContentsOfURL:url];
//cell.imageView.image = [UIImage imageWithData:data];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;

}

解决方案

trips = [allTrips retain];

Your trips array is being autoreleased - try retaining it and see if you still get the error.

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