#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        NSArray *list = @[@"条目1",@"条目2"];    self._dataList = list;        UITableView *table        = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];            self._tableView = table;        self._tableView.dataSource = self;    self._tableView.delegate   = self;        [self.view addSubview:self._tableView];        NSOperationQueue *queue=[[NSOperationQueue alloc]init];    self._queue = queue;    }#pragma mark - Table view data source- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];        if(cell == nil){                //cell的四种样式：        //UITableViewCellStyleDefault,      // 默认风格，自带标题和一个图片视图，图片在左        //UITableViewCellStyleValue1,        // 只有标题和副标题 副标题在右边        //UITableViewCellStyleValue2,        // 只有标题和副标题，副标题在左边标题的下边        //UITableViewCellStyleSubtitle      // 自带图片视图和主副标题，主副标题都在左边，副标题在下        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];            }                NSString *url = @"http://XXXXX.com/article/uploadfile/2014/0905/20140905042806503.jpg";        NSOperation *operation = [NSBlockOperation blockOperationWithBlock:^{        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];                UIImage *image = [UIImage imageWithData:data];        dispatch_async(dispatch_get_main_queue(), ^{            printf("height = %f\r", image.size.height);            printf("width = %f\r", image.size.width);                                    cell.imageView.image = image;        });    }];            [self._queue addOperation:operation];        cell.imageView.image = [UIImage imageNamed:@"default.jpg"];    cell.textLabel.text = [self._dataList objectAtIndex:[indexPath row]];    cell.detailTextLabel.text = @"详细信息";        return cell;}- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return [self._dataList count];}#pragma mark - Table view delegate- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {        NSString *value = [__dataList objectAtIndex:[indexPath row]];        printf("value = %s", [value UTF8String]);}@end