尝试使用 UIImage: imageNamed: 设置 cell.image 感到困惑：

发布于 2024-07-23 12:03:37 字数 1889 浏览 2 评论 0原文

我创建了一个包含 NSDictionary 结构的 plist。键是一个标签（我用它来填充 tableview cell.text），值是一个文件名，我想用它来“动态”填充 cell.image。确切的 png 文件名将加载到项目中。

为了让事情变得更简单（我是这么想的），我将 plist 加载到 NSDictionary 中，然后将其分成两个数组（使用 allKeys 和 allValues）。

在尝试设置单元格图像时，我不明白为什么它有效：

cell.image = [UIImage imageNamed:@"bad.png"];

并且这不起作用（在模拟器中 - 我在调试器中遇到应用程序崩溃和呕吐）：

cell.image = [UIImage imageNamed:[rowImageList objectAtIndex:indexPath.row]];

我可以将下一行放在第二段代码之前并且它可以工作很好，看来我从 objectAtIndex 获取了一个 NSString：

NSLog(@"Image name: %@", [rowImageList objectAtIndex:indexPath.row]);

我还尝试创建一个临时 NSString 并为其分配 [rowImageList objectAtIndex:]，然后使用该 NSString 来提供 imageNamed:。

以下是来自调试器的一些信息：

-[NSCFArray length]：无法识别的选择器发送到实例 0x262d910
由于未捕获而终止应用程序例外 'NSInvalidArgumentException'，原因： '*** -[NSCFArray 长度]：无法识别选择器发送到实例 0x262d910'

如果您需要更多信息/代码，请告诉我。

编辑：这是我填充 rowImageList 的方法：

NSArray *myRowImages = [[NSArray alloc] init]; 
myRowImages = [searchFilterList allValues]; 
self.rowImageList = [myRowImages copy]; 
[myRowImages release]; 
//where searchFilterList is an NSDictionary that I loaded from a plist

这是我的 plist 的屏幕截图： [IMG][]1 [/IMG]

编辑：修改 rowImageList 人口：

 NSMutableArray *myRowImages = [[NSMutableArray alloc] init];
 NSEnumerator *enumerator = [searchFilterList objectEnumerator];
 id object;

 while ((object = [enumerator nextObject])) {
     [myRowImages addObject:[object objectAtIndex:0]];
 }
 self.rowImageList = myRowImages; //edit: added self. prefix
 [myRowImages release];

原文

I created a plist that contains an NSDictionary structure. The key is a label (which I use to populate tableview cell.text) and the value is a file name that I want to use to 'dynamically' populate cell.image. The exact png filenames are loaded into the project.

To make things easier (so I thought), I load the plist into an NSDictionary, then pull that apart into two arrays (using allKeys and allValues).

In attempting to set a cell image, I dont understand why this works:

cell.image = [UIImage imageNamed:@"bad.png"];

and this does not (in simulator - I get an app crash and barfing in debugger):

cell.image = [UIImage imageNamed:[rowImageList objectAtIndex:indexPath.row]];

I can put this next line right before the second piece of code and it works just fine, so it appears that I am getting an NSString from objectAtIndex:

NSLog(@"Image name: %@", [rowImageList objectAtIndex:indexPath.row]);

I have also tried creating a temp NSString and assigning [rowImageList objectAtIndex:] to it, then using that NSString to supply imageNamed:.

Here is some info from debugger:

-[NSCFArray length]: unrecognized selector sent to instance 0x262d910
Terminating app due to uncaught
exception
'NSInvalidArgumentException', reason:
'*** -[NSCFArray length]: unrecognized
selector sent to instance 0x262d910'

Let me know if you need more info/code.

Edit: Here's how I populate rowImageList:

NSArray *myRowImages = [[NSArray alloc] init]; 
myRowImages = [searchFilterList allValues]; 
self.rowImageList = [myRowImages copy]; 
[myRowImages release]; 
//where searchFilterList is an NSDictionary that I loaded from a plist

Here's a screenshot of my plist:
[IMG][]1
[/IMG]

Edit: revised rowImageList population:

 NSMutableArray *myRowImages = [[NSMutableArray alloc] init];
 NSEnumerator *enumerator = [searchFilterList objectEnumerator];
 id object;

 while ((object = [enumerator nextObject])) {
     [myRowImages addObject:[object objectAtIndex:0]];
 }
 self.rowImageList = myRowImages; //edit: added self. prefix
 [myRowImages release];

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