[英]UIImageView not displaying set image from UITableViewController
我有一個帶有圖像名稱列表的UITableViewController
。 單擊某個名稱時,將在ImageViewController
設置圖像的URL,然后UITableViewController
轉換為包含UIImageView
(與插座連接)的ImageViewController
。 在ImageViewController
的viewDidLoad
我將UIImageView
設置為URL中的圖像,但是當我在模擬器上運行它時,圖像應該只出現黑屏。
segue的一點視覺描述(其中 - >表示segue):
ImageListTableViewController
- > ImageViewController(具有UIImageView
) ImageListTableViewController.m
// The delegate here is the ImageViewController
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"Show Image"]) {
[self setDelegate:segue.destinationViewController];
}
}
// getting URL and calling the protocol method (in ImageViewController) which sets
// the image as an @property
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *imageDict = [self.imageArray objectAtIndex:indexPath.row];
NSURL *imageURL = [FlickrFetcher urlForPhoto:imageDict format:FlickrPhotoFormatLarge];
NSLog([imageURL description]);
[self.delegate imageListTableViewController:self withURL:imageURL];
}
ImageViewController.m
#import "ImageViewController.h"
@implementation ImageViewController
@synthesize image = _image;
@synthesize imageView = _imageView;
- (void)imageListTableViewController:(ImageListTableViewController *)sender
withURL:(NSURL *)imageURL;
{
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
self.image = [UIImage imageWithData:imageData];
}
#pragma mark - View lifecycle
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
// nothing
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
[self.imageView setImage:self.image];
}
- (void)viewDidUnload
{
[self setImageView:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
@end
關於發生了什么的任何想法? 謝謝!
不是使用委托的正確方法。 試試這個:在ImageViewController.h
:
@property(nonatomic,strong) NSURL *imageURL;
在ImageViewController.m
@synthesize imageURL;
刪除imageListTableViewController
更改viewDidLoad
:
- (void)viewDidLoad
{
[super viewDidLoad];
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
self.image = [UIImage imageWithData:imageData];
}
添加到viewDidUnload
:
[self setImageURL:nil];
然后在ImageListTableViewController.m
:更改prepareForSegue
:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"Show Image"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSDictionary *imageDict = [self.imageArray objectAtIndex:indexPath.row];
NSURL *imageURL = [FlickrFetcher urlForPhoto:imageDict format:FlickrPhotoFormatLarge];
// Set the property on our Dest VC
ImageViewController *ivc = segue.destinationViewController;
ivc.imageURL = imageURL;
}
}
更改你的didSelectRowAtIndexPath
:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:@"Show Image" sender:nil];
}
確保已將Segue連接到VC本身而不是TableView。 如果不這樣,那么Sese會在觸發didSelectRowAtIndexPath
之前被解雇。 在這種情況下,它不會有所作為,但對於真正的控制 - 養成連接VC並在需要時調用performSegue的習慣。
嘗試調用此方法:
[self.imageView setImage:self.image];
在里面 -
(void)imageListTableViewController:(ImageListTableViewController *)sender
withURL:(NSURL *)imageURL;
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