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淡若秋菊何妨瘦, 清到梅花不畏寒.

 
 
 

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iPhone UITableView异步加载图片 (动态加载图片)  

2011-01-21 16:55:36|  分类: iphone |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |

LazyTableImages 苹果官方的例子

//-----------方法1----------------


//AsyncImageView.h


#import <UIKit/UIKit.h>

@interface AsyncImageView : UIView {
        NSURLConnection*connection;

        NSMutableData*data;

}


- (void)loadImageFromURL:(NSURL*)url;

@end

 

//AsyncImageView.m

#import "AsyncImageView.h"
@implementation AsyncImageView

- (id)initWithFrame:(CGRect)frame {

    if ((self = [super initWithFrame:frame])) {

        // Initialization code

    }

    return self;

}

- (void)loadImageFromURL:(NSURL*)url {

          if(connection!=nil) { 

                [connection release];

         }

         if(data!=nil) {

                [data release];

         }

         NSURLRequest* request = [NSURLRequest requestWithURL:url   cachePolicy:NSURLRequestUseProtocolCachePolicy  timeoutInterval:30.0];

       connection= [[NSURLConnection alloc] initWithRequest:request delegate:self];

       //TODO error handling, what if connection is nil?

}


- (void)connection:(NSURLConnection*)theConnection   didReceiveData:(NSData*)incrementalData {

             if(data==nil) {

                  data=[[NSMutableData alloc]initWithCapacity:2048];

             }

             [data appendData:incrementalData];

}


- (void)connectionDidFinishLoading:(NSURLConnection*)theConnection {

    [connection release];

    connection=nil;

    if([[self subviews]count]>0) {

           [[[self subviews] objectAtIndex:0] removeFromSuperview];

    }

   UIImageView*imageView= [[[UIImageView alloc]initWithImage:[UIImage imageWithData:data]]autorelease];

   imageView.contentMode=UIViewContentModeScaleAspectFit;

    imageView.autoresizingMask= (UIViewAutoresizingFlexibleWidth||UIViewAutoresizingFlexibleHeight);

    [self  addSubview:imageView];

    imageView.frame=self.bounds;

    [imageView setNeedsLayout];

    [self setNeedsLayout];

    [data release];

    data=nil;

}


- (UIImage*) image {

UIImageView *iv = [[self subviews]objectAtIndex:0];

return[iv image];

}



/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code

}

*/


- (void)dealloc {

    [connection cancel];

    [connection release];

    [data release];

    [super dealloc];

}



@end



在uitableview 中调用

// Customize the appearance of table view cells.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    

    static NSString *CellIdentifier = @"Cell";

  

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

}else{

AsyncImageView* oldImage = (AsyncImageView*)[cell.contentView viewWithTag:999];

[oldImage removeFromSuperview];

    }

CGRect frame;

frame.size.width=150; frame.size.height=75;

frame.origin.x=20; frame.origin.y=5;

AsyncImageView *asyncImage = [[[AsyncImageView alloc] initWithFrame:frame] autorelease];

asyncImage.tag =999;

//NSString *strUrl = [imagesArray objectAtIndex:indexPath.row]

NSString *strUrl = @"http://merrimusings.mu.nu/archives/images/groundhog2.jpg";

NSURL *url = [NSURL URLWithString:strUrl];


[asyncImage loadImageFromURL:url];

//[cell.contentView addSubview:asyncImage];

[cell addSubview:asyncImage];

//cell.textLabel.text = [dataArray objectAtIndex:indexPath.row];

cell.textLabel.text = @"ok";

cell.textLabel.font = font;

cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;

}



//--------------方法2-------------


// Customize the appearance of table view cells.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    

    static NSString *CellIdentifier = @"Cell";

  

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[UITableViewCell allocinitWithStyle:UITableViewCellStyleDefaultreuseIdentifier:CellIdentifier] autorelease];

}


[NSThread detachNewThreadSelector:@selector(updateImageForCellAtIndexPath:) toTarget:self withObject:indexPath];



UIFont *font = [UIFont fontWithName:@"Helvetica" size:17];

//cell.textLabel.text = [dataArray objectAtIndex:indexPath.row];

cell.textLabel.text = @"ok";

cell.textLabel.font = font;

cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;

}


- (void)updateImageForCellAtIndexPath:(NSIndexPath *)indexPath{

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    UIImage *image = [self getImageForCellAtIndexPath:indexPath];

     if (image) {

            NSLog(@"image ok %d",indexPath.row);

     }

    UITableViewCell *cell = [self.tbView cellForRowAtIndexPath:indexPath];

CGRect rect;

UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectMake(KNewCollectionImageViewX+5, kTopButtonMargin, KShopCellImageViewWidth, KShopCellImageViewHeight)];

iv.tag = KImageViewTag;

iv.backgroundColor = [UIColor clearColor];

rect = iv.frame;

//iv.image = image;

[cell addSubview:iv];

//cell.imageView.image = image;

    //[cell.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];

[iv performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];

[iv release];

    //[image release];

    [pool release];

}


-(UIImage *)getImageForCellAtIndexPath:(NSIndexPath *)indexPath{

   // id path = [[dataArray objectAtIndex:indexPath.row] objectForKey:@"image"];

//id path = [imageArray objectAtIndex:indexPath.row];

//id path = @"http://merrimusings.mu.nu/archives/images/groundhog2.jpg";

NSString *path = @"http://merrimusings.mu.nu/archives/images/groundhog2.jpg";


NSURL *url = [NSURL URLWithString:path];

NSData *data = [NSData dataWithContentsOfURL:url];

//UIImage *image = [[UIImage alloc] initWithData:data cache:NO];

   // NSURL *url = [NSURL URLWithString:path];

    //NSData *data = [NSData dataWithContentsOfURL:url];

    //UIImage *image = [[UIImage alloc] initWithData:data cache:NO];

//UIImage *image = [[UIImage alloc] initWithData:data cache:NO]; 


UIImage *image = [UIImage imageWithData:data];

if (image) {

NSLog(@"%@",path);

}


    return image;

}

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