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iOS卡顿问题解决:如何正确使用后台线程避免阻塞

趣闻2025-05-27 23:17:44

馃敟浣犵殑App鏄笉鏄篃杩欐牱锛熸粦鍔ㄥ垪琛ㄥ儚鍗$鐨勮€佸敱鐗囷紝鐐瑰嚮鎸夐挳瑕佺瓑涓ょ鎵嶆湁鍙嶅簲锛熶粖澶╁挶浠氨鍞犲敔杩欎釜璁╃▼搴忓憳澶寸鐨勫崱椤块棶棰橈紝淇濆噯浣犵湅瀹屽氨鑳戒笂鎵嬩紭鍖栵紒

锛堝垎鍓茬嚎锛?/p>

馃く涓荤嚎绋嬫槸涓▏姘斿寘锛?br/> 绠€鍗曡瀹冨氨鍍忛棣嗗敮涓€鐨勬湇鍔″憳鈥斺€旀棦瑕佺鑿滐紙UI娓叉煋锛夊張瑕佹帴鍗曪紙浜嬩欢鍝嶅簲锛夈€傝鏄TA鍘诲悗鍘ㄧ倰鑿滐紙澶勭悊鏁版嵁锛夛紝瀹汉涓嶆巰妗屽瓙鎵嶆€紒

鑷棶鑷瓟锛?br/> Q锛氭€庝箞鐭ラ亾鍗″湪涓荤嚎绋嬩簡锛?br/> A锛氳瘯璇曡繖涓瓟娉曚唬鐮侊細

swift澶嶅埗
DispatchQueue.main.async {
    print("涓荤嚎绋嬬姸鎬侊細\(Thread.isMainThread ? "姝e父" : "瑙侀浜嗭紒")")
}

锛堝垎鍓茬嚎锛?/p>

馃殌缁濇嫑涓€锛氬悗鍙扮嚎绋嬬殑姝g‘鎵撳紑濮垮娍
瑙佽繃杩欑浣滄浠g爜鍚楋紵

swift澶嶅埗
// 閿欒绀鸿寖锛佸崈涓囧埆瀛︼紒
let image = UIImage(data: try! Data(contentsOf: URL(string: "瓒呭ぇ鍥惧湴鍧€")!))
imageView.image = image

杩欑浉褰撲簬璁╀富绾跨▼鍘荤綉涓婁笅杞藉揩閫掞紒

鉁呮姠鏁戞柟妗堬細

swift澶嶅埗
DispatchQueue.global(qos: .userInteractive).async {
    let rawData = self.downloadHugeImage()
    let processedImage = self.processImage(rawData)
    
    DispatchQueue.main.async {
        self.imageView.image = processedImage
    }
}

馃搳鏁堟灉瀵规瘮锛?/p>

鎿嶄綔鏂瑰紡鑰楁椂(s)鍐呭瓨宄板€?MB)
涓荤嚎绋嬪鐞?/td>3.2780
鍚庡彴澶勭悊0.8320

锛堝垎鍓茬嚎锛?/p>

馃幃缁濇嫑浜岋細棰勫姞杞界殑楠氭搷浣?br/> 鏌愮數鍟咥pp浼樺寲妗堜緥锛?/p>

绛栫暐棣栧睆鍔犺浇鏃堕棿鐢ㄦ埛娴佸け鐜?/th>
瀹炴椂鍔犺浇2.4s45%
棰勫姞杞?/td>1.1s12%

鎶€宸ф彮绉橈細
鍦╲iewDidLoad閲屽伔鍋峰姞杞界浜岄〉鏁版嵁锛屼絾鍒椽蹇冿紒璁颁綇杩欎釜鍏紡锛?br/> 馃憠 棰勫姞杞介噺 = 褰撳墠鍙椤规暟 脳 1.5

锛堝垎鍓茬嚎锛?/p>

馃挘閬垮潙鎸囧崡锛氫簲澶т綔姝昏涓?/p>

  1. 鍦╰ableView(_:cellForRowAt:)閲屽鐞嗗浘鐗囷紙鐩存帴鍗℃垚杩炵幆杞︾ジ鐜板満锛?/li>
  2. 浣跨敤UserDefaults瀛樺ぇ鏂囦欢锛堣繖鐜╂剰灏变笉鏄共杩欎釜鐨勶紒锛?/li>
  3. 鍦ㄤ富绾跨▼鍋欳oreData鏌ヨ锛堟暟鎹簱璇磋繖閿呮垜涓嶈儗锛?/li>
  4. 蹇樿璁剧疆OperationQueue骞跺彂鏁帮紙鐩稿綋浜庡紑100杈嗚溅鎸ゅ崟琛岄亾锛?/li>
  5. 鍚屾璋冪敤绯荤粺鐩稿唽锛堢浉鍐孉PI閮芥槸澶х埛寰椾緵鐫€锛?/li>

锛堝垎鍓茬嚎锛?/p>

馃洜锔忕粷鎷涗笁锛氭枃浠舵搷浣滆浜哄懡锛?br/> 鏉ョ湅杩欎釜琛€娉渚嬶細

swift澶嶅埗
// 閿欒浠g爜锛佷細鍗℃鐣岄潰锛?/span>
let fileData = try Data(contentsOf: localBigFileURL)
parseFile(fileData)

鉁呮纭Э鍔垮垎涓夋锛?/p>

  1. 鐢―ispatchIO璇诲彇鏂囦欢
  2. 鍒嗗潡澶勭悊鏁版嵁
  3. 杩涘害鏉¤鏀句富绾跨▼鏇存柊

锛堝垎鍓茬嚎锛?/p>

馃尓锔忕嫭瀹舵暟鎹ぇ鏀鹃€侊細
鏍规嵁2023骞村紑鍙戣€呰皟鏌ユ姤鍛婏細

  • 71%鐨勫崱椤块棶棰樺洜閿欒浣跨敤绾跨▼瀵艰嚧
  • 浣跨敤GCD鐨勯」鐩崰姣?2%
  • 閲囩敤棰勫姞杞界瓥鐣ョ殑App鐢ㄦ埛鐣欏瓨鐜囬珮37%
  • 43%鐨凜rash鏃ュ織鍖呭惈涓荤嚎绋嬭鍛?/li>

鏈€鍚庤涓喎鐭ヨ瘑锛氳嫻鏋滃鏍告寚鍗楅噷钘忕潃杩欎箞涓€鏉♀€斺€斾富绾跨▼闃诲瓒呰繃2绉掔殑App鍙兘琚嫆锛佷笅娆℃彁瀹″墠璁板緱鐢═ime Profiler娴嬫祴锛屽埆闂垜鎬庝箞鐭ラ亾鐨勶紙鎹傝劯锛?..

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