開發(fā)中的問題集合

1.Terminating app due to uncaught exception 'NSUnknownKeyException', reason

網(wǎng)上搜了一大堆恰聘，都是說XIB的關(guān)聯(lián)問題，我把xib文件刪除了連接，重新連了一下商膊，還是報(bào)錯(cuò)类嗤。后來發(fā)現(xiàn)是我的代碼問題裂七。

NSMutableDictionary *dict = (NSMutableDictionary *)array.lastObject;
[dict setValue:textString forKey:@"limit"];

array.lastObject不是可變字典褥符，這里我把它強(qiáng)轉(zhuǎn)了，導(dǎo)致
[dict setValue:textString forKey:@"limit"];報(bào)錯(cuò)韭寸。
用 NSDictionary 就可以了春哨。

2. 重新安裝xcode cocoapods出現(xiàn)

          Unable to download data from https://gems.ruby-china.org/ - bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)```， 即執(zhí)行``` sudo gem install cocoapods

出現(xiàn)的錯(cuò)
執(zhí)行 sudo -i, 進(jìn)入到 root 去執(zhí)行該命令

sudo -i

在去執(zhí)行

sudo gem install cocoapods

結(jié)果為

Successfully installed cocoapods-1.6.1
Parsing documentation for cocoapods-1.6.1
Done installing documentation for cocoapods after 2 seconds
1 gem installed

退出root, 重新打開一個(gè)窗口恩伺，執(zhí)行 pod --version赴背，查看版本，但是現(xiàn)在又報(bào)錯(cuò)了

Ignoring executable-hooks-1.4.2 because its extensions are not built.  Try: gem pristine executable-hooks --version 1.4.2
Ignoring gem-wrappers-1.3.2 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.3.2
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems.rb:241:in `bin_path': can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)
    from /usr/local/bin/pod:22:in `<main>'

接著刪除了gem ,清除所有包舊版本晶渠，保留最新版

gem cleanup

結(jié)果為

Cleaning up installed gems...
Clean Up Complete

查看gem版本

gem update

結(jié)果為

2.6.14

接著執(zhí)行

gem update

又報(bào)錯(cuò)了

Updating installed gems
ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
    bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)

解決辦法：
先后執(zhí)行下面2行代碼：

sudo gem sources -r https://rubygems.org
結(jié)果為：
Password:
source https://rubygems.org not present in cache

sudo gem sources -a http://rubygems.org
結(jié)果為：
https://rubygems.org is recommended for security over http://rubygems.org

Do you want to add this insecure source? [yn]  y
http://rubygems.org added to sources

就可以正常安裝了
執(zhí)行

sudo gem install cocoapods

結(jié)果為：

………………(代表還有很多命令)
Parsing documentation for molinillo-0.6.6
Installing ri documentation for molinillo-0.6.6
Parsing documentation for atomos-0.1.3
Installing ri documentation for atomos-0.1.3
Parsing documentation for nanaimo-0.2.6
Installing ri documentation for nanaimo-0.2.6
Parsing documentation for xcodeproj-1.8.1
Installing ri documentation for xcodeproj-1.8.1
Parsing documentation for fourflusher-2.2.0
Installing ri documentation for fourflusher-2.2.0
Parsing documentation for ruby-macho-1.4.0
Installing ri documentation for ruby-macho-1.4.0
Parsing documentation for cocoapods-1.6.1
Installing ri documentation for cocoapods-1.6.1
Done installing documentation for cocoapods-core, cocoapods-downloader, cocoapods-trunk, molinillo, atomos, nanaimo, xcodeproj, fourflusher, ruby-macho, cocoapods after 9 seconds
WARNING:  Unable to pull data from 'https://gems.ruby-china.org/': bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)
10 gems installed

3. 更新cocoaPods凰荚，執(zhí)行命令 sudo gem update --system .出現(xiàn)了錯(cuò)誤： ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)； bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)

原來是cocoapods更新了褒脯，本來是1.6.0便瑟，執(zhí)行了下面命令更新pod之后，版本變?yōu)?.7.0.beta.3

sudo gem install -n /usr/local/bin cocoapods --pre

再去執(zhí)行一些命令就好了

4. ld: framework not found Pods__________ clang: error: linker command failed with exit code 1 (use -v to see invocation)

出現(xiàn)這個(gè)問題番川，把Build Settings ---->的 Other Linker Flags里面的所有庫都刪除了胳徽，就只剩下了第二個(gè)圖里面的

2291553674047_.pic_hd.jpg

2301553675241_.pic_hd.jpg

然后把Build Phases 的Linker Binary With Libraries刪除不存在（顯示為顏色灰白）的庫
在command +shift +k, 清空一下，重新運(yùn)行爽彤，即可了

5. ld: library not found for -lstdc++.6.0.9 , clang: error: linker command failed with exit code 1 (use -v to see invocation)

多數(shù)情況下是文件路徑配置問題
在Building Phases下面的 Link Binary With Libraries把這個(gè)庫show In Finder, 發(fā)現(xiàn)并不是在工程里路徑下，重新把它拖到了工程目錄里面缚陷，就好了适篙。

2331553839647_.pic.jpg

2341553840027_.pic.jpg

6. Could not insert new outlet connection, could not find any information for the class named DemoViewController

把DemoViewController.h 和 DemoViewController.m 先show In finder, 拷貝出來，在工程里面刪除箫爷，重新添加就好了

7. cell復(fù)用問題導(dǎo)致頁面上展示的數(shù)組順序錯(cuò)亂

在實(shí)例化cell的時(shí)候, 把cell的賦值放在了實(shí)例化的方法里,, 出現(xiàn)了cell復(fù)用的問題,每次cell為空的時(shí)候,就會創(chuàng)建一個(gè), 重新賦值,就會出現(xiàn)問題

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
      LoanPartTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"loanPartCell"];
      if (cell == nil) {
            cell = [[LoanPartTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"loanPartCell"];
            cell.selectionStyle = UITableViewCellSelectionStyleNone;
            cell.model = self.sectionOneNewArray[indexPath.row];
      }
     return cell;
}

把cell的賦值拿到外面去實(shí)現(xiàn), 或者直接采用tableview注冊cell的方法就可以避免這個(gè)問題

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
      LoanPartTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"loanPartCell"];
      if (cell == nil) {
            cell = [[LoanPartTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"loanPartCell"];
            cell.selectionStyle = UITableViewCellSelectionStyleNone;
      }
      cell.model = self.sectionOneNewArray[indexPath.row];
     return cell;
}

8. tableview頁面滑動時(shí)卡頓, 來回切換視圖,卡頓時(shí), 優(yōu)化方法

把圖片放在異步線程中加載, 采用緩存的形式, SDWebImage

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{

        if (!([model.iconUrlStr isKindOfClass:[NSNull class]])) {
            NSString *urlStr = [QiNiuDownLoadUrl stringByAppendingString:model.iconUrlStr];
            urlStr =  [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
           [self.iconIMV sd_setImageWithURL:[NSURL URLWithString:urlStr] placeholderImage:[UIImage imageNamed:@"home_laba"]]; //小喇叭圖標(biāo)獲取
        }
});