3

我不断收到 exc bad access 错误，我认为这与我的 UIPickerView 有关，因为这是应用程序崩溃的时候。一切正常，直到我从 UIPickerView 做出第 9 个选择。每次应用程序在第 9 个选择时崩溃。有任何想法吗？

- (void)viewDidLoad {
        [super viewDidLoad];



     list = [[NSMutableArray alloc] init];
     [list addObject:@"Anvil"];
     [list addObject:@"Apple"];
     [list addObject:@"Arrow"];
     [list addObject:@"Baby"];
     [list addObject:@"Basketball"];
     [list addObject:@"Beehive"];
     [list addObject:@"Blimp"];
     [list addObject:@"Bomb"];
     [list addObject:@"Bungee Jumper"];
     [list addObject:@"Cactus"];
     [list addObject:@"Cake"];
     [list addObject:@"Car"];
     [list addObject:@"Caterpillar"];
     [list addObject:@"Couch"];
     [list addObject:@"Dennis"];

        anvil = [UIImage imageNamed:@"anvil.png"];
     apple = [UIImage imageNamed:@"apple.png"];
     arrow = [UIImage imageNamed:@"arrow.png"];
     baby = [UIImage imageNamed:@"baby.png"];
     basketball = [UIImage imageNamed:@"basketball.png"];
     beehive = [UIImage imageNamed:@"beehive.png"];
     blimp = [UIImage imageNamed:@"blimp.png"];
     bomb = [UIImage imageNamed:@"bomb.png"];
     bungeejumper = [UIImage imageNamed:@"bungeejumper.png"];
     cactus = [UIImage imageNamed:@"cactus.png"];
     cake = [UIImage imageNamed:@"cake.png"];
     car = [UIImage imageNamed:@"car.png"];
     caterpillar = [UIImage imageNamed:@"caterpillar.png"];
     couch = [UIImage imageNamed:@"couch.png"];
     dennis = [UIImage imageNamed:@"dennis.png"];
    }

    -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView{
     return 1;
    }

    -(NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component{

     return [list count];
    }

    -(NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

     return [list objectAtIndex:row];
    }

    - (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

     if([[list objectAtIndex:row] isEqual:@"Anvil"]) {
      [object setImage:anvil];
     }
     else if([[list objectAtIndex:row] isEqual:@"Apple"]) {
      [object setImage:apple];
     }
     else if([[list objectAtIndex:row] isEqual:@"Arrow"]) {
      [object setImage:arrow];
     }
     else if([[list objectAtIndex:row] isEqual:@"Baby"]) {
      [object setImage:baby];
     }
     else if([[list objectAtIndex:row] isEqual:@"Basketball"]) {
      [object setImage:basketball];
     }
     else if([[list objectAtIndex:row] isEqual:@"Beehive"]) {
      [object setImage:beehive];
     }
     else if([[list objectAtIndex:row] isEqual:@"Blimp"]) {
      [object setImage:blimp];
     }
     else if([[list objectAtIndex:row] isEqual:@"Bomb"]) {
      [object setImage:bomb];
     }
     else if([[list objectAtIndex:row] isEqual:@"Bungee Jumper"]) {
      [object setImage:bungeejumper];
     }
     else if([[list objectAtIndex:row] isEqual:@"Cactus"]) {
      [object setImage:cactus];
     }
     else if([[list objectAtIndex:row] isEqual:@"Cake"]) {
      [object setImage:cake];
     }
     else if([[list objectAtIndex:row] isEqual:@"Car"]) {
      [object setImage:car];
     }
     else if([[list objectAtIndex:row] isEqual:@"Caterpillar"]) {
      [object setImage:caterpillar];
     }
     else if([[list objectAtIndex:row] isEqual:@"Couch"]) {
      [object setImage:couch];
     }
     else if([[list objectAtIndex:row] isEqual:@"Dennis"]) {
      [object setImage:dennis];
     }
    }

- (void)dealloc {
 [list release];
    [super dealloc];
 [animation release];
}
4

2 回答 2

4

你没有保留你的 UIImages，所以它们会被自动释放。在每次 imageNamed 调用之后，您需要一个保留，即

baby = [[UIImage imageNamed:@"baby.png"] retain];

或者，如果您已将它们声明为属性（即@property (nonatomic, retain) UIImage *baby;），您可以这样做：

self.baby = [UIImage imageNamed:@"baby.png"];

这是更正确的方法。

但是，处理所有这些代码的更好方法可能是使用图像数组，而不是每次都检查名称。IE

imageArray = [NSArray alloc] initWithObjects:
              [UIImage imageNamed:@"Anvil.png"],
              [UIImage imageNamed:@"Apple.png"],
              [UIImage imageNamed:@"Arrow.png"],
              nil];

然后，当一个项目被选中时，

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    [object setImage:[imagearray objectAtIndex:row]];
 }

这有点清洁;）

编辑：道格拉斯在我写答案的后半部分时对清理代码有同样的想法:)

于 2010-03-11T16:31:08.297 回答
0

第九个对象是唯一一个名称中有空格的对象吗？我看不出这会如何破坏它，寻找它与其他之间的差异。该图像不称为“bungeejumper.png”而不是“bungeejumper.png”是吗？

除了：而不是字符串列表，你可以有一个图像标题对的列表，例如，

// ... snip ...
[self addPairWithTitle:@"Anvil" image:@"anvil.png"];
[self addPairWithTitle:@"Apple" image:@"apple.png"];

- (void) addPairWithTitle .... 
{
    // you'll need to define a MyNewPair object which retains the image and title
    [list addObject:[[MyNewPair alloc] initWithTitle:title andImage:[UIImage imageNamed:imageName]];
}

// ... snip ...

... titleForRow...
return [[list objectAtIndex:row] title];

...didSelectRow...
[object setImage:[[list objectAtIndex:row]] image];
于 2010-03-11T16:33:55.220 回答