我使用縮略圖圖像在UITableView中顯示數據。最初,當單擊單元格時,我將從服務器重新加載圖像,這會花費額外的時間,資源和內存。我並沒有這樣做,而是想將縮略圖圖像的指針傳遞給屏幕上的視圖並立即顯示,而不必重新下載它。但是,我遇到了一個問題 - 當我將新視圖上的imageView設置爲舊圖像時,什麼也沒有加載。這裏是我的代碼:圖像未在UIImageView上加載
這是我的UITableView類:
CustomCell *cell = (CustomCell *)[tableView cellForRowAtIndexPath:indexPath];
NewsViewController *newsViewController = [[NewsViewController alloc] initWithNibName:@"NewsViewController" bundle:nil dictionary: dict type:d numberOfPages:1 image: cell.imageView.image];
NewsViewController.m:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil dictionary:(NSDictionary *)dict type:(NSInteger)type numberOfPages:(NSInteger)pages image:(UIImage *)image{
self = [super initWithNibName:@"NewsViewController" bundle:Nil];
if (self) {
newsText = [dict objectForKey:@"content"];
newsTitle = [dict objectForKey:@"title"];
newsDate = [dict objectForKey:@"pub_date"];
d = type;
numberOfPages = pages;
imageURL = [[NSMutableArray alloc] initWithCapacity:numberOfPages];
mainImage = [[UIImage alloc] init];
mainImage = image;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
labelBody.text= newsText;
titleView.text = newsTitle;
date.text = newsDate;
if (numberOfPages == 1) {
imageScrollView.contentSize = CGSizeMake(320, 303);
pageControl.numberOfPages = 1;
CustomImageView *customImageView = [[CustomImageView alloc] initWithFrame:imageScrollView.bounds];
[imageScrollView addSubview:customImageView];
customImageView.imageView.image = mainImage;
}
}
NewsViewController.h
#import <UIKit/UIKit.h>
#import "AdWhirlView.h"
#import "AdWhirlDelegateProtocol.h"
@class Reachability;
@interface NewsViewController : UIViewController<AdWhirlDelegate, UIScrollViewDelegate>{
AdWhirlView *adView;
IBOutlet UILabel *labelBody;
IBOutlet UILabel *titleView;
IBOutlet UILabel *subTitle;
IBOutlet UILabel *date;
IBOutlet UIScrollView *scrollView;
IBOutlet UIScrollView *imageScrollView;
IBOutlet UIImageView *backgroundImage;
IBOutlet UIImage *mainImage;
IBOutlet UIPageControl *pageControl;
NSInteger numberOfPages;
NSMutableArray *imageURL;
}
@property(nonatomic,retain)AdWhirlView *adView;
@property (nonatomic, retain) NSMutableArray *imageURL;
@property (nonatomic, retain) IBOutlet UIPageControl *pageControl;
@property (nonatomic, retain) IBOutlet UIScrollView *imageScrollView;
@property (nonatomic, weak) IBOutlet UIImageView *backgroundImage;
@property (nonatomic, retain) IBOutlet UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UIScrollView *scrollView;
@property (nonatomic, retain) IBOutlet UIImage *mainImage;
@property (nonatomic, strong) NSString *newsText;
@property (nonatomic, strong) NSString *newsTitle;
@property (nonatomic, strong) NSString *newsDate;
@property (nonatomic, assign) NSInteger numberOfPages;
@property (nonatomic, strong) IBOutlet UILabel *titleView;
@property (nonatomic, strong) IBOutlet UILabel *labelBody;
@property (nonatomic, strong) IBOutlet UILabel *subTitle;
@property (nonatomic, strong) IBOutlet UILabel *date;
@property (nonatomic, retain) Reachability* internetReachable;
@property (nonatomic, assign) BOOL internetActive;
-(void) checkNetworkStatus:(NSNotification *)notice;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil dictionary: (NSDictionary *)dict type:(NSInteger)type numberOfPages:(NSInteger) pages image:(UIImage *)image;
- (BOOL)checkInternet;
- (void)doStuff;
- (IBAction)ad;
@end
我使用mainImage作爲(UIImage *),並試圖用我的customImageView類替換主圖像中的圖像,但沒有顯示向上。我在這裏錯過了什麼?
我不認爲你需要在此處分配/初始化映像: 'mainImage = [[UIImage alloc] init]; mainImage = image;' – Marty 2012-07-24 23:34:14
我試着不分配/啓動它,我試圖直接設置它相等,我甚至嘗試initWithCGImage並從圖像獲取CGImage。他們都沒有工作 – kamran619 2012-07-24 23:40:23
是的,我認爲它不會幫助任何東西,只是通過代碼注意到它。 – Marty 2012-07-24 23:51:27