试图显示图像数组,代码将iphone返回主屏幕

Question

这是问题代码:

代码是显示一个图像数组,然后可以滚动浏览.

- (void)viewDidLoad {
    [super viewDidLoad];

    NSArray *photos = [[NSArray arrayWithObjects:   
                        [UIImage imageNamed:@"Event.png"],
                        [UIImage imageNamed:@"Logo.png"],
                        [UIImage imageNamed:@"default.png"],
                        [UIImage imageNamed:@"LittleLogoImage.png"],
                        nil] retain];      // TODO – fill with your photos

    // note that the view contains a UIScrollView in aScrollView

    int i=0;
    int width = 0;
    int height = 0;
    for ( NSString *image in photos )
    {
        UIImage *image = [UIImage imageNamed:[photos objectAtIndex:i]];
        UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        imageView.clipsToBounds = YES;

        imageView.frame = CGRectMake( imageView.frame.size.width * i++, 0, imageView.frame.size.width, imageView.frame.size.height);

        [aScrollView addSubview:imageView];
        width = imageView.frame.size.width;
        height = imageView.frame.size.height;

        [imageView release];
    }
    aScrollView.contentSize = CGSizeMake(width*i, height);
    aScrollView.delegate = self;
}

有任何想法吗？

[会议开始于2011-05-07 22:46:47 +0100.] 2011-05-07 22:46:49.314 ALPHA [1171:207] load01 2011-05-07 22:47:13.749 ALPHA [1171:207 ] 2 2011-05-07 22:47:13.751 ALPHA [1171:207] dealloc01 2011-05-07 22:47:13.755 ALPHA [1171:207] load02 2011-05-07 22:47:19.791 ALPHA [1171: 207] 4 2011-05-07 22:47:19.792 ALPHA [1171:207] dealloc02 2011-05-07 22:47:19.795 ALPHA [1171:207] - [UIImage长度]:无法识别的选择器发送到实例0x4b20f60 2011- 05-07 22:47:19.797 ALPHA [1171:207] *由于未捕获的异常'NSInvalidArgumentException'终止应用程序,原因:' - [UIImage长度]:无法识别的选择器发送到实例0x4b20f60'*第一次调用堆栈:(0 CoreFoundation
0x00dca5a9 exceptionPreprocess + 185 1 libobjc.A.dylib
0x00f1e313 objc_exception_throw + 44 2 CoreFoundation
0x00dcc0bb - [NSObject(NSObject)doesNotRecognizeSelector:] + 187 3
CoreFoundation
0x00d3b966 __ forwarding + 966 4
CoreFoundation
0x00d3b522 _CF_forwarding_prep_0 + 50 5 UIKit
0x003e3568 _UIImageAtPath + 36 6
ALPHA
0X 000037fd - [PhotosView viewDidLoad] + 597 7 UIKit
0x0036a089 - [UIViewController视图] + 179 8 ALPHA
0x00002af3 - [ALPHAViewController displayView:] + 500 9 ALPHA
0x00002707 - [ALPHAAppDelegate displayView:] + 60 10 ALPHA
0x00002cdd - [View2 viewPhotos:] + 99 11 UIKit
0x002ba4fd - [UIApplication sendAction:to:from:forEvent:] + 119 12 UIKit
0x0034a799 - [UIControl sendAction:to:forEvent:] + 67 13 UIKit
0x0034cc2b - [UIControl(Internal)_sendActionsForEvents:withEvent:] + 527 14 UIKit的
0x0034b7d8 - [UIControl touchesEnded:withEvent:方法] + 458 15的UIKit
0x002deded - [一个UIWindow _sendTouchesForEvent:] + 567 16的UIKit
0x002bfc37 - [UIApplication的的SendEvent:] + 447 17的UIKit 0x002c4f2e _UIApplicationHandleEvent + 7576 18个GraphicsServices
0x01722992 PurpleEventCallback + 1550 19的CoreFoundation
0x00dab944 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION + 52 20 CoreFoundation 0x00d0bcf7 __CFRunLoopDoSource1 + 215 21 CoreFoundation
0x00d08f83 __CFRunLoopRun + 979 22 CoreFoundation
0x00d08840 CFRunLoopRunSpeci
fic + 208 23 CoreFoundation 0x00d08761 CFRunLoopRunInMode + 97 24 GraphicsServices
0x017211c4 GSEventRunModal + 217 25 GraphicsServices
0x01721289 GSEventRun + 115 26 UIKit 0x002c8c93 UIApplicationMain + 1160 27 ALPHA
0x000026a8 main + 102 28 ALPHA
0x00002639 start + 53)

抛出'NSException'实例后终止调用

再次感谢,

插口

Answer 1

for ( NSString *image in photos )
{
    UIImage *image = [UIImage imageNamed:[photos objectAtIndex:i]];
    ...

这是你的问题.你有一个NSString和一个UIImage名字相同的东西.当你重新声明你NSString的时候UIImage,你就会混淆你的forin循环.循环似乎仍然认为你有一个NSString,当实际上,你有一个UIImage.因此,我们的第一步是尝试使用此代码替换该代码:

for ( NSString *imageName in photos )
{
    UIImage *image = [UIImage imageNamed:imageName];
    ...

但是,该代码也不起作用.幸运的是,你的images阵列已经存储了UIImages,所以你根本不需要它NSString!因此,您可以使用以下代码替换循环的前三行:

for ( UIImage *image in photos )
{
    ...

而已!你根本不需要你的UIImage *image = ...线,因为它是在括号中创建的.

希望这可以帮助!