今天我将
Xcode 6升级到beta 5(来自beta 1),你可以想象我发现我之前完美运行的
Swift应用程序充满了各种错误(好吧,从beta 1有很多变化).在所有错误中,有一个我无法弄清楚如何修复.它与swift闭包有关,特别是.enumerateGroupsWithTypes方法的enumerationBlock参数.这是代码：
assetLib.enumerateGroupsWithTypes(ALAssetsGroupType(ALAssetsGroupSavedPhotos),usingBlock: {
(group: ALAssetsGroup?,stop: CMutablePointer<ObjCBool>) in
...
},failureBlock: {
(error: NSError!) in
...
})
这确实在Swift(Xcode 6 beta 1)中完美运行.但现在,我得到2个错误：
>
” ‘UnsafeMutablePointer’ is not a subtype of ‘error type’ “
>
” Use of undeclared type ‘CMutablePointer’ “
很明显,CMutablePointer不再存在,所以我试图修改stop参数,如：
...,stop: UnsafeMutablePointer<ObjCBool> ...
在这个改变之后,第二个错误显然消失了,但第一个转变为：
” Could not find an overload for ‘init’ that accepts the supplied arguments “
我甚至尝试将UnsafeMutablePointer更改为UnsafePointer,如this post所示.
编辑：
以下是enumerateGroupsWithTypes方法的完整代码：
assetLib.enumerateGroupsWithTypes(ALAssetsGroupType(ALAssetsGroupSavedPhotos),usingBlock: {
(group: ALAssetsGroup?,stop: UnsafeMutablePointer<ObjCBool>) in
if group != nil {
group!.setAssetsFilter(ALAssetsFilter.allPhotos())
group!.enumerateAssetsAtIndexes(NSIndexSet(index: group!.numberOfAssets()-1),options: nil,usingBlock: {
(result: ALAsset!,index: Int,stop: UnsafeMutablePointer<ObjCBool>) in
if result {
var alAssetRapresentation: ALAssetRepresentation = result.defaultRepresentation()
url = alAssetRapresentation.url()
}
})
}
else if group == nil {
assetLib.assetForURL(url,resultBlock: {
(asset: ALAsset!) in
if asset != nil {
var assetRep: ALAssetRepresentation = asset.defaultRepresentation()
var iref = assetRep.fullResolutionImage().takeUnretainedValue()
var image = UIImage(CGImage: iref)
imageView.image = image
self.view.addSubview(imageView)
let mask = CAShapeLayer()
mask.path = UIBezierPath(ovalInRect: CGRectMake(0,200,200)).CGPath
mask.frame = CGPathGetPathBoundingBox(mask.path)
mapView.layer.mask = mask
self.view.addSubview(mapView)
}
},failureBlock: {
(error: NSError!) in
NSLog("Error!",nil)
})
}
},failureBlock: {
(error: NSError!) in
NSLog("Error!",nil)
})