我使用SDWebImage库从服务器下载图像。在我的代码中，我正面临图像加载问题＆amp; SDwebImage。问题是：我编写了这样的代码：
[cell.imgNews setImageWithURL:[NSURL URLWithString:[self.arrImages objectAtIndex:indexPath.row]]
如果我给我这样的话，我的应用程序工作顺利＆amp;快速。但图像没有加载。它只显示空单元格。显示空单元格的原因是一些图像以阿拉伯语命名，并且名称的空间为Ex。％20。
我的问题是：我们如何才能在图像单元格中显示阿拉伯语命名图像（您可以看到波纹管屏幕截图）？ （注意：显示的图像很少以英文命名）
但是图像正在调试区中下载（你可以看到屏幕截图here）
要使用此代码转义该空单元格：
[cell.imgNews setImageWithURL:[NSURL URLWithString:[[self.arrImages objectAtIndex:indexPath.row] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]
问题是，如果我使用此代码，应用程序变得非常慢。我该如何解决这个问题？
任何人都可以帮我解决这个问题吗？
这是我的代码：
NewsViewController.m
#import "NewsViewController.h"
#import "NewsTableViewCell.h"
#import "NewDetailsViewController.h"
#import <SDWebImage/UIImageView+WebCache.h>
#import "SearchVC.h"
@interface NewsViewController ()
{
NSString *temString;
NSMutableString *strTemp;
BOOL isDateSearch;
int search;
}
@property(strong,nonatomic) NSArray *SearchResultsArray;
@end
@implementation NewsViewController
@synthesize arrImages;
@synthesize TittleOne;
@synthesize TittleTwo;
@synthesize TittleThree;
@synthesize datepicker;
@synthesize PickerContainer;
@synthesize datepickerTittle;
@synthesize searchBr;
@synthesize NewsIndicator;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
#pragma mark - View Life Cycle
- (void)viewDidLoad
{
[self performSelector:@selector(myindicator) withObject:nil afterDelay:10.0];
[super viewDidLoad];
search=0;
self.searchBr.hidden=YES;
self.searchBr.barTintColor = UIColorFromRGB(0Xe54c41);
self.searchBr.backgroundColor = UIColorFromRGB(0Xe54c41);
[self removeUISearchBarBackgroundInViewHierarchy:self.searchDisplayController.searchBar];
self.searchDisplayController.searchBar.backgroundColor = NO;
[TittleOne setFont: [UIFont fontWithName:@"GEEast-ExtraBold" size:12]];
[TittleTwo setFont: [UIFont fontWithName:@"GEEast-ExtraBold" size:12]];
[TittleThree setFont: [UIFont fontWithName:@"GEEast-ExtraBold" size:10]];
NSDateFormatter *dateFormatter=[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd/MM/yyyy"];
NSLog(@"%@",[dateFormatter stringFromDate:[NSDate date]]);
[TittleTwo setText:[dateFormatter stringFromDate:[NSDate date]]];
// [[UIColor redColor] set];
[datepickerTittle setFont:[UIFont fontWithName:@"GEEast-ExtraBold" size:12]];
// [datepickerTittle.textColor= [UIColor yellowColor]];
isDateSearch=NO;
self.arrTitles =[[NSMutableArray alloc] init];
self.arrDescription=[[NSMutableArray alloc]init];
self.arrImages=[[NSMutableArray alloc]init];
self.arrDate=[[NSMutableArray alloc]init];
self.arrUrls=[[NSMutableArray alloc]init];
self.arrDateSearch=[[NSMutableArray alloc]init];
//[self performSelectorInBackground:@selector(requestingForNews:) withObject:nil];
// dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), s^{
self.spinnerView.hidden=YES;
[self makeRequestForNews];
// self.spinnerView.stopAnimating;
//});
// Do any additional setup after loading the view.
[self imagedownloader:@"http://www.shura.bh/MediaCenter/News/"];
self.SearchResultsArray = [[NSArray alloc] init ];
}
-(void)myindicator {
[NewsIndicator stopAnimating];
NewsIndicator.hidden =YES;
[self.tblNews reloadData];
}
-(void)requestingForNews:(id)sender
{
[self makeRequestForNews];
}
-(void) imagedownloader : (NSString *)urlStringOfImage
{
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
dispatch_async(queue, ^{
//downlaod image
NSURL *imageUrl = [NSURL URLWithString:urlStringOfImage];
NSData *imageData = [NSData dataWithContentsOfURL:imageUrl];
UIImage *image = [UIImage imageWithData:imageData];
dispatch_async(dispatch_get_main_queue(), ^{
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50, 50 )];
imageView.image = image;
[self.view addSubview:imageView];
});
});
}
- (void) removeUISearchBarBackgroundInViewHierarchy:(UIView *)view
{
for (UIView *subview in [view subviews]) {
if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
[subview removeFromSuperview];
break; //To avoid an extra loop as there is only one UISearchBarBackground
} else {
[self removeUISearchBarBackgroundInViewHierarchy:subview];
}
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - make request for news
-(void)makeRequestForNews
{
NSURL *url =[NSURL URLWithString:self.strNewsApi];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
//After making request the apparent thing is expecting the response that may be expected response or an Error. so create those objects and intialize them with NULL.
NSURLResponse *response = NULL;
NSError *requestError =NULL;
//Once you have response with you , Capture YOur Responce data using NsData.
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&requestError];
//Convert the respnse Data into Response String.
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
//Now We can start parsing the Data using XMl parser . you need XML parser in-order to use the below class method "dictionaryFOrXMLString".
NSError *parserError = NULL;
//XML parsing
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:responseData];
[xmlParser setDelegate:self];
[xmlParser parse];
// NSURL *url = [NSURL URLWithString:url];
// NSData *data = [NSData dataWithContentsOfURL:url];
// UIImage *image = [UIImage imageWithData:data];
//NSDictionary *xmlDict = [XMLReader dictionaryForXMLString:responseString error:NULL];
//once you have xmlDict handy, you can pass this to the any ViewController (Like table view) to populate the Data.
}
- (void)parserDidEndDocument:(NSXMLParser *)parser {
}
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:@"ShuraNews"])
{
}
if ([elementName isEqualToString:@"PUBLISHINGPAGEIMAGE"])
{
}
strTemp=[NSMutableString new];
}
-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
//temString =string;
[strTemp appendString:string];
}
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if ([elementName isEqualToString:@"TITLE"])
{
NSLog(@"temstring=== %@", strTemp);
[self.arrTitles addObject:strTemp];
}
if ([elementName isEqualToString:@"PUBLISHINGPAGECONTENT"])
{
NSLog(@"temstring=== %@", strTemp);
[self.arrDescription addObject:strTemp];
}
if ([elementName isEqualToString:@"NEWSARTICLEDATE"])
{
NSLog(@"temstring=== %@", strTemp);
[self.arrDate addObject:strTemp];
}
if ([elementName isEqualToString:@"PUBLISHINGPAGEIMAGE"])
{
NSLog(@"temstring=== %@", strTemp);
[self.arrImages addObject:strTemp];
}
if ([elementName isEqualToString:@"ShuraNews"])
{
[self.tblNews reloadData];
// self.spinnerView.hidden=YES;
}
if ([elementName isEqualToString:@"URL"])
{
[self.arrUrls addObject:strTemp];
}
}
#pragma mark - TabeView Datasource//delegate method
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (tableView == self.searchDisplayController.searchResultsTableView)
{
return [self.SearchResultsArray count];
}
else
{
return [self.arrTitles count];
}
if (isDateSearch)
{
return [self.arrDateSearch count];
}
else{
return [self.arrTitles count];
}
return [self.arrTitles count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView setSeparatorInset:UIEdgeInsetsZero];
static NSString *cellIdentifier=@"cellNews";
NewsTableViewCell *cell=(NewsTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
// NewsTableViewCell *cell=(NewsTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (cell == nil)
{
cell = [[NewsTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
// cell.NewsTableViewCell.textColor = UIColorFromRGB(0x000000);
cell.backgroundColor=[UIColor clearColor];
}
if (tableView == self.searchDisplayController.searchResultsTableView)
{
cell.textLabel.text= [self.SearchResultsArray objectAtIndex:indexPath.row];
}
if( [indexPath row] % 2){
cell.contentView.backgroundColor =UIColorFromRGB(0Xffffff);
}
else{
cell.contentView.backgroundColor =UIColorFromRGB (0Xdcdcdc);
}
//selectbackground color start
UIView *NewsTableViewCell = [[UIView alloc] initWithFrame:cell.frame];
NewsTableViewCell.backgroundColor = UIColorFromRGB(0Xdcdcdc);
cell.selectedBackgroundView = NewsTableViewCell; //select background colro end
cell.lblTitles.font = [UIFont fontWithName:@"GEEast-ExtraBold" size:12];
if (isDateSearch)
{
cell.lblTitles.text=[[self.arrDateSearch objectAtIndex:indexPath.row]objectForKey:@"title"];
}
else{
cell.lblTitles.text=[self.arrTitles objectAtIndex:indexPath.row];
}
cell.lblDescription.font =[UIFont fontWithName:@"GE SS Unique" size:12];
cell.lblDate.font=[UIFont fontWithName:@"GE SS Unique" size:12];
if (isDateSearch)
{
cell.lblDescription.text=[[self.arrDateSearch objectAtIndex:indexPath.row]objectForKey:@"des"];
}
else{
cell.lblDescription.text=[self.arrDescription objectAtIndex:indexPath.row];
}
cell.lblDate.text=[self.arrDate objectAtIndex:indexPath.row];
cell.lblTitles.textAlignment= NSTextAlignmentRight;
cell.lblDate.textAlignment = NSTextAlignmentRight;
cell.lblDescription.textAlignment = NSTextAlignmentRight;
NSData *data;
if (isDateSearch)
{
data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[self.arrDateSearch objectAtIndex:indexPath.row]objectForKey:@"img"]]];
}
else{
data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[self.arrImages objectAtIndex:indexPath.row]]];
}
//SDWebImage Code for lazy loader
[cell.imgNews setImageWithURL: //[NSURL URLWithString:[self.arrImages objectAtIndex:indexPath.row]]
[NSURL URLWithString:[[self.arrImages objectAtIndex:indexPath.row] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
// if (![self.arrImages objectAtIndex:indexPath.row])
// if ((cell.imgNews.image = image))
if (image)
{
cell.imgNews.layer.borderColor = [UIColor blackColor].CGColor;
cell.imgNews.layer.borderWidth = 2.0;
cell.lblTitles.frame=CGRectMake(cell.lblTitles.frame.origin.x, cell.lblTitles.frame.origin.y, 208, cell.lblTitles.frame.size.height);
cell.lblDate.frame=CGRectMake(cell.lblDate.frame.origin.x, cell.lblDate.frame.origin.y, 208, cell.lblDate.frame.size.height);
cell.lblDescription.frame=CGRectMake(cell.lblDescription.frame.origin.x, cell.lblDescription.frame.origin.y, 206, cell.lblDescription.frame.size.height);
}
else {
// if (!cell.imgNews ==nil)
if (!cell.imgNews.image)
{
cell.lblTitles.frame=CGRectMake(cell.lblTitles.frame.origin.x, cell.lblTitles.frame.origin.y, 283, cell.lblTitles.frame.size.height);
cell.lblDate.frame=CGRectMake(cell.lblDate.frame.origin.x, cell.lblDate.frame.origin.y, 286, cell.lblDate.frame.size.height);
cell.lblDescription.frame=CGRectMake(cell.lblDescription.frame.origin.x, cell.lblDescription.frame.origin.y, 281, cell.lblDescription.frame.size.height);
cell.imgNews.layer.borderColor = [UIColor blackColor].CGColor;
cell.imgNews.layer.borderWidth = 0;
}
}
}];
[PickerContainer setHidden:YES];
return cell;
}
#pragma Search Methods
-(void)filterContentForSearchText:(NSString *)searchText scope:(NSString *)scope
{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains [search] %@", searchText];
self.SearchResultsArray = [self.arrTitles filteredArrayUsingPredicate:predicate];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
return YES;
}
- (void)layoutSubviews
{
if(!(searchBr == nil))
{
searchBr.frame = CGRectMake(4, 5, 185, 30);
}
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *dict=nil;
if (isDateSearch)
{
dict=[[NSDictionary alloc]initWithObjectsAndKeys:[NSString stringWithFormat:@"%@",[[self.arrDateSearch objectAtIndex:indexPath.row]objectForKey:@"title"]],@"title",[NSString stringWithFormat:@"%@",[[self.arrDateSearch objectAtIndex:indexPath.row]objectForKey:@"des"]],@"img",[NSString stringWithFormat:@"%@",[self.arrDescription objectAtIndex:indexPath.row]],@"Des",[NSString stringWithFormat:@"%@",[self.arrUrls objectAtIndex:indexPath.row]],@"url", nil];
}
else{
dict=[[NSDictionary alloc]initWithObjectsAndKeys:[NSString stringWithFormat:@"%@",
[self.arrTitles objectAtIndex:indexPath.row]],@"title",[NSString stringWithFormat:@"%@",
[self.arrImages objectAtIndex:indexPath.row]],@"img",[NSString stringWithFormat:@"%@",
[self.arrDescription objectAtIndex:indexPath.row]],@"Des",[NSString stringWithFormat:@"%@",
[self.arrDate objectAtIndex:indexPath.row]],@"Date",[NSString stringWithFormat:@"%@",
[self.arrUrls objectAtIndex:indexPath.row]],@"url", nil];
}
[self performSegueWithIdentifier:@"NewsDetailsID" sender:dict];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"NewsDetailsID"])
{
((NewDetailsViewController *)segue.destinationViewController).strTitle=[sender objectForKey:@"title"];
((NewDetailsViewController *)segue.destinationViewController).strDetailImage=[sender objectForKey:@"img"];
((NewDetailsViewController *)segue.destinationViewController).strDescription=[sender objectForKey:@"Des"];//strUrl
((NewDetailsViewController *)segue.destinationViewController).strDate=[sender objectForKey:@"Date"];
((NewDetailsViewController *)segue.destinationViewController).strUrl=[sender objectForKey:@"url"];
}
}
- (IBAction)SearchButton:(id)sender {
if (search == 0) {
searchBr.hidden=NO;
search=1;
}
else
{
searchBr.hidden=YES;
search=0;
}
}
- (IBAction)backBtnClicked:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}
- (IBAction)DatePickerBt:(id)sender {
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
PickerContainer.frame = CGRectMake(0, 150, 320, 261);
[PickerContainer setHidden:NO];
}
- (IBAction)HideButton:(id)sender
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
PickerContainer.frame = CGRectMake(0,600, 320, 261);
[UIView commitAnimations];
if ([self.arrDate count])
{
for (int i=0; i<[self.arrDate count]; i++)
{
NSArray *arrDateStr=[[self.arrDate objectAtIndex:i] componentsSeparatedByString:@" "];
// NSString *dateString=[NSString stringWithFormat:@"%@ %@",[[arrDateStr objectAtIndex:0]stringByReplacingOccurrencesOfString:@"/" withString:@"-"],[arrDateStr objectAtIndex:1]];
NSString *dateString=[NSString stringWithFormat:@"%@ %@",[arrDateStr objectAtIndex:0],[arrDateStr objectAtIndex:1]];
NSDateFormatter *format = [[NSDateFormatter alloc]init];
[format setDateFormat:@"dd/MM/yyyy"];
NSDate *currentDate = [format dateFromString:dateString];
if ([[[[NSString stringWithFormat:@"%@",currentDate]componentsSeparatedByString:@" "]objectAtIndex:0] isEqualToString:[[[NSString stringWithFormat:@"%@",self.datepicker.date]componentsSeparatedByString:@" "]objectAtIndex:0]])
{
isDateSearch=YES;
NSDictionary *dictTemp=[NSDictionary dictionaryWithObjectsAndKeys:[self.arrTitles objectAtIndex:i],@"title",[self.arrDescription objectAtIndex:i],@"des",[self.arrImages objectAtIndex:i],@"img", nil];
[self.arrDateSearch addObject:dictTemp];
[self.tblNews reloadData];
NSLog(@"dates equal");
}
}
}
}
- (IBAction)ReloadButton:(id)sender {
self.spinnerView.hidden=YES;
isDateSearch=NO;
[self makeRequestForNews];
NSLog(@"RELOADING!!!!!!!!!!!!!!!");
}
@end
答案 0 :(得分：0)
你绝对应该使用stringByAddingPercentEscapesUsingEncoding，我认为这不是“本身”导致你看到的性能问题。这只是修改你使用的URL。
我倾向于认为通过使用stringByAddingPercentEscapesUsingEncoding你的应用程序获取所有图像（而不是只有少数几个），这会让它变得更慢。
例如，如果您下载的图片很大，那么这可能会解释应用程序的缓慢程度，无论是等待图像可用的时间长度还是缩小到单元格大小。
编辑：
我查看了网站http://www.shura.bh/MediaCenter/News，图片确实很大。他们需要花很长时间才能在Safari中下载。我发现图像大到4000x3000px，这肯定太大了。