UIActivity custom share, thumbnail icon not be shown when touch more button

Question

My app support iOS 7+, I use UIActivity image size: 60pt for iPhone, 76pt for iOS for iPad,

When touch more button to re-order the items, it can't show the icon in the list.

CODE as below:

class ZYShare {
class ActivityItem {
    init() {
        self.title = ""
        self.icon = ""
    }

    var title: String?
    var icon: String?
    var type: ShareType = ShareTypeAny
}

class CommonActivity: UIActivity {
    lazy var itemInfo = ActivityItem()

    override func prepareWithActivityItems(activityItems: [AnyObject]) {
        // do something

    }

    override func canPerformWithActivityItems(activityItems: [AnyObject]) -> Bool {
        return true
    }

    override class func activityCategory() -> UIActivityCategory {
        return UIActivityCategory.Action
    }

    override func activityType() -> String? {

        return NSLocalizedString(itemInfo.title ?? "", comment: "")
    }

    override func activityTitle() -> String? {
        return NSLocalizedString(itemInfo.title ?? "", comment: "")
    }

    override func activityImage() -> UIImage? {
        println(itemInfo.icon)

        if let icon = itemInfo.icon {
            return UIImage(named: icon)
        } else {
            return nil
        }
    }

    override func performActivity() {
        ShareSDK.showShareViewWithType(itemInfo.type
            , container: nil
            , content: publishContent
            , statusBarTips: false
            , authOptions: authOptions
            , shareOptions: options
            , result: handle)

        self.activityDidFinish(true)
    }
}

class QQActivity: CommonActivity {
    override init() {
        super.init()

        self.itemInfo.icon = "ShareToQQ"
        self.itemInfo.title = "QQ"
        self.itemInfo.type = ShareTypeQQ
    }
}

class WeChatSessionActivity: CommonActivity {
    override init() {
        super.init()

        self.itemInfo.icon = "ShareToWeChat"
        self.itemInfo.title = "微信"
        self.itemInfo.type = ShareTypeWeixiSession
    }
}

class WeChatTimelineActivity: CommonActivity {
    override init() {
        super.init()

        self.itemInfo.icon = "ShareToWeChatTimeLine"
        self.itemInfo.title = "朋友圈"
        self.itemInfo.type = ShareTypeWeixiTimeline
    }
}

class QQSpaceActivity: CommonActivity {
    override init() {
        super.init()

        self.itemInfo.icon = "ShareToQzone"
        self.itemInfo.title = "QQ空间"
        self.itemInfo.type = ShareTypeQQSpace
    }
}
}

Answer 1

Quite old question, but maybe the solution is helpful for others too!

In your UIActivity subclass implement/overwrite the method

- (UIImage *)activityImage {
    return [UIImage imageNamed:@"Activity Icon"];
}

to return the image to be shown in the UIActivityViewController itself (as you've done).

In addition to this implement/overwrite the method

- (UIImage *)activitySettingsImage {
    return [UIImage imageNamed:@"Activity Settings Icon"];
}

to return an(other or the same) image to be shown in the more/settings view.

I haven't found the second method in the docs, but it is none of the '_xx' method of UIAction, so I would guess it isn't private...

Answer 2

UIActivity has an undocumented activitySettingsImage property. The following code shows how to implement it with Swift 3 in order to display a thumbnail of your custom activity in the "Activities" list:

import UIKit

class MyActivity: UIActivity {

    override var activityType: UIActivityType? {
        return UIActivityType(rawValue: String(describing: classForCoder))
    }

    override var activityTitle: String? {
        return "My Activity Title"
    }

    override var activityImage: UIImage? {
        return UIImage(named: "icon")
    }

    var activitySettingsImage: UIImage? {
        return UIImage(named: "icon")
    }

    override class var activityCategory: UIActivityCategory {
        return .share
    }

    /* ... */
}

Note that you don't have not override activitySettingsImage to implement it in your code.

Answer 3

I found the solution in Swift.

@objc var _activitySettingsImage: UIImage? {
    return UIImage(named: "icon")!
}

The image is 29x29 + @2x + @3x. Rather activityImage, no mask is apply to the image. If you want rounded corners, you must add them.

Works with Swift 5 on iOS 12