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我想添加一個iMessage擴展到我現有的應用程序來提供自定義貼紙。 首先，我做的事：貼片擴展與外部來源
的Xcode>文件>添加目標>即時聊天擴展
然後，我發現畫面，我可以作爲測試貼紙使用的一些網址。
我的控制器看起來像這樣：
import UIKit
import Messages
class MessagesViewController: MSMessagesAppViewController, MSStickerBrowserViewDataSource {
var stickers = [MSSticker]();
var url = ["http://iconizer.net/files/Brightmix/orig/monotone_close_exit_delete_small.png","https://upload.wikimedia.org/wikipedia/commons/d/d5/Japan_small_icon.png"];
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
print(" ----- HERE");
loadStickers();
createStickerBrowser();
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Stickers Handling
func loadStickers() {
print(" ----- loadStickers");
for i in 0...1 {
do {
let sticker = try MSSticker(contentsOfFileURL: URL(string: url[i])!, localizedDescription: "\(i)")
print(" \(i) : \(sticker)");
stickers.append(sticker)
} catch {
print("error \(error)");
}
}
}
func createStickerBrowser() {
print(" ----- createStickerBrowser");
let controller = MSStickerBrowserViewController(stickerSize: .large)
addChildViewController(controller)
view.addSubview(controller.view)
controller.stickerBrowserView.backgroundColor = UIColor.gray
controller.stickerBrowserView.dataSource = self;
view.topAnchor.constraint(equalTo: controller.view.topAnchor).isActive = true
view.bottomAnchor.constraint(equalTo: controller.view.bottomAnchor).isActive = true
view.leftAnchor.constraint(equalTo: controller.view.leftAnchor).isActive = true
view.rightAnchor.constraint(equalTo: controller.view.rightAnchor).isActive = true
}
// MARK: - MSStickerBrowserViewDataSource
func numberOfStickers(in stickerBrowserView: MSStickerBrowserView) -> Int {
return stickers.count
}
func stickerBrowserView(_ stickerBrowserView: MSStickerBrowserView, stickerAt index: Int) -> MSSticker {
return stickers[index]
}
// MARK: - Conversation Handling
override func willBecomeActive(with conversation: MSConversation) {
// Called when the extension is about to move from the inactive to active state.
// This will happen when the extension is about to present UI.
// Use this method to configure the extension and restore previously stored state.
print("----- willBecomeActive");
}
override func didResignActive(with conversation: MSConversation) {
// Called when the extension is about to move from the active to inactive state.
// This will happen when the user dissmises the extension, changes to a different
// conversation or quits Messages.
// Use this method to release shared resources, save user data, invalidate timers,
// and store enough state information to restore your extension to its current state
// in case it is terminated later.
print("----- didResignActive");
}
override func didReceive(_ message: MSMessage, conversation: MSConversation) {
// Called when a message arrives that was generated by another instance of this
// extension on a remote device.
// Use this method to trigger UI updates in response to the message.
}
override func didStartSending(_ message: MSMessage, conversation: MSConversation) {
// Called when the user taps the send button.
}
override func didCancelSending(_ message: MSMessage, conversation: MSConversation) {
// Called when the user deletes the message without sending it.
// Use this to clean up state related to the deleted message.
}
override func willTransition(to presentationStyle: MSMessagesAppPresentationStyle) {
// Called before the extension transitions to a new presentation style.
// Use this method to prepare for the change in presentation style.
}
override func didTransition(to presentationStyle: MSMessagesAppPresentationStyle) {
// Called after the extension transitions to a new presentation style.
// Use this method to finalize any behaviors associated with the change in presentation style.
}
}
我沒有看到我的任何打印和背景色爲好，但我看不到我的貼紙。 Apple doc這樣說：
fileURL此貼紙顯示的圖像的URL。該URL必須是 指的是保存在設備上的文件。該文件必須是PNG，APNG， GIF或JPEG，並且必須小於500 KB。爲獲得最佳效果， 圖像不應小於100 x 100點或大於206 x 206點。始終提供@ 3x圖像（300 x 300像素至618 x 618 像素）。系統通過在運行時縮減 @ 3x圖像來生成@ 2x和@ 1x版本。
那麼你知道一種方法來保存本地圖片從服務器下載？
