ios - 当我调用 requestImage 时应用程序崩溃

Question

当调用此方法时，我的应用程序因错误 Thread 1: EXC_BAD_INSTRUCTION 而崩溃:

imageManager.requestImage(for: asset!, targetSize: CGSize(width:100,height:100), contentMode: .aspectFit, options: options, resultHandler: {(image,info) -> Void in})

View 中的完整代码已加载:

    override func viewDidLoad() {
    super.viewDidLoad()
    collectionView.delegate = self;
    collectionView.dataSource = self;

    let fetchResult = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: nil);
    let asset = fetchResult.firstObject;

    let options = PHImageRequestOptions()
    options.deliveryMode = .fastFormat
    options.isSynchronous = true

    let imageManager = PHCachingImageManager();
    imageManager.requestImage(for: asset!, targetSize: CGSize(width:100,height:100), contentMode: .aspectFit, options: options, resultHandler: {(image,info) -> Void in
    print("Got image")
    })
}

任何人都知道可能导致错误的原因是什么？我认为这与关闭有关，但我不确定哪里出了问题......

这是我尝试调用的方法语法:

func requestImage(for asset: PHAsset, targetSize: CGSize, contentMode: PHImageContentMode, options: PHImageRequestOptions?, resultHandler: (UIImage?, [NSObject : AnyObject]?) -> Void) -> PHImageRequestID

谢谢!

Answer 1

让@James Zaghini 的回答更上一层楼。

您还需要检查 UIImage 或信息是否为 nil。

guard let asset = asset else { return }

let imageManager = PHCachingImageManager();
imageManager.requestImage(for: asset, targetSize: CGSize(width:100,height:100), contentMode: .aspectFit, options: options, resultHandler: {(image,info) -> Void in
    if let img = image{
        print("Got Image")
    }
    if let imgInfo = info{
        print("Info")
    }
})