添加同一个控件多次到父控件，最终只会添加一个该控件
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TableView中设置backgroundView，设置ImageView出不来？
因为target为7，设置图片只有8才可以
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1.url编码
ios中http请求遇到汉字的时候，需要转化成UTF-8，用到的方法是：
NSString * encodingString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
2.url解码
请求后，返回的数据，如何显示的是这样的格式：%3A%2F%2F，此时需要我们进行UTF-8解码，用到的方法是：
NSString *str = [model.album_name stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
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dataSourceArray和reloadData都要在主线程中完成
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*** Assertion failure in -[UITableView _dequeueReusableViewOfType:withIdentifier:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.30.14/UITableView.m:6532
解决：因为使用的tableViewCell的xib绑定了identifier，如果注册时候不跟xib保持一致就会报错，或者是代码哪里写错了，仔细检查代码。
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后面带有UI_APPEARANE_SELECTOR的方法，都可以通过appearance统一设置
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IQKeyboardManager
键盘在切换textfield的时候出现顺序有误，跟添加textfield控件顺序有关，调整顺序即可解决
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获取子View所在控制器
- (UIViewController *)viewController
{
for (UIView* next = [self superview]; next; next = next.superview) {
UIResponder *nextResponder = [next nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return (UIViewController *)nextResponder;
}
}
return nil;
}
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This file is set to build for a version older than the project deployment target. Functionality may be limited.
解决方法：
选中xib 的文件，在 Builds for 中修改 Project Deployment Target
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library not found for . . .
解决：.a文件未上传到服务器
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libc++abi.dylib: terminate_handler unexpectedly threw an exception
2016.01.23
遇到了这个情况，发现是因为我从xib里拖出来的属性，被我改了名字导致
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App installation failed
This application‘s application-identifier entitlement does not match that of the installed application. These values must match for an upgrade to be allowed.
解决：
iPhone上已经装了包标识符一样的 App，删掉再运行。
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开发注意：
如果你建了一个类，比如：NCQRCodeViewController
那么你就不能在创建NCQRCodeView(包含xib)这样的类，否则会崩溃，原因是因为NCQRCodeViewController会先去找NCQRCodeView.xib，纳尼!就错在这儿了。
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ios9后打开百度、高德地图需要以下配置
在info.plist添加白名单
<key>LSApplicationQueriesSchemes</key>
<array>
<string>baidumap</string>
<string>iosamap</string>
</array>
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设置状态栏样式
1 修改info.plist文件，让UIApplication设置样式
添加 View controller-based status bar appearance 并设置为 NO
2 设置样式
在appdelegate中application.statusBarStyle = UIStatusBarStyleLightContent;
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Provisioning profile is expiring warning
~/Library/MobileDevice/Provisioning Profiles/
删除掉所有的profile在重新下载
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directory not found for option ‘-L
解决方法：
修改路径:选择项目名称----->Targets----->Build Settings----->Search Paths----->Library Search Paths
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==15481==ERROR: AddressSanitizer: heap-buffer-overflow
edit scheme…->Run->Diagnostics->取消 Enable Address Sanitizer
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Scale:拉伸图片
Aspect：图片长宽的比例，保持图形的长宽比，保持图片不变形。
Aspect Fill：在保持长宽比的前提下，缩放图片，使图片充满容器。
Aspect Fit：在保持长宽比的前提下，缩放图片，使得图片在容器内完整显示出来。
Scale to Fill: 缩放图片,使图片充满容器。图片未必保持长宽比例协调，有可能会拉伸至变形。
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桌面图标通知
// 注册推送, 用于iOS8以及iOS8之后的系统
if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert) categories:nil];
[application registerUserNotificationSettings:settings];
}
application.applicationIconBadgeNumber = 1;
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The identity used to sign the executable is no longer valid.
步骤：
- 打开Xcode配置（Xcode -> Preferences...）
- 选择Accounts页面，选中你的Apple ID，点右下方的「View Detail...」按钮
- 点击左下角的刷新按钮，等待刷新完成，点「Done」按钮，关闭Xcode配置窗口
- 重新编译运行项目，若出现修复窗口，一路点「Fix Issue」按钮
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设备的provis文件地址
/Users/mashangyouqian/Library/MobileDevice/Provisioning Profiles
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This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release
把需要更新UI的放在的主线程就好了
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The identity used to sign the executable is no longer valid
删掉~/Library/MobileDevice/Provisioning Profiles/ 下所有文件, 在重新下载
下载:Xcode->Preference...->AppleID->ViewDetails->DownloadAll
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-(void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
// 开启系统返回手势
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// 禁用系统返回手势
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}
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#pragma mark - tap和didSelect冲突解决
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"]) {
// 如果返回NO,则gesture recognizer会忽略此触摸事件
return NO;
}
return YES;
}
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CUICatalog: Invalid asset name supplied: (null)
原因imageNamed为空
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iOS项目工程，添加一个c文件，编译报错
解决方案：
将#import用包裹起来
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svn 提交 is out of date
update
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给 App 瘦身的另一个手段是提交 Bitcode 给 Apple，而不是最终的二进制。Bitcode 是 LLVM 的中间码，在编译器更新时，Apple 可以用你之前提交的 Bitcode 进行优化，这样你就不必在编译器更新后再次提交你的 app，也能享受到编译器改进所带来的好处。Bitcode 支持在新项目中是默认开启的，没有特别理由的话，你也不需要将它特意关掉。
视频 app 的画中画模式相对简单一些，如果你使用 AVPlayerLayer 来播放视频的话，那什么都不用做就已经支持了。但如果你之前选择的方案是 MPMoviePlayerViewController 的话，你可能也需要尽早迁移到 AVKit 的框架下来，因为 Media Player 将在 iOS 9 被标记为 deprecated 并不再继续维护。
滑动覆盖和分割视图的 app 会使用 iOS 8 引入的 Size Class 中的 Compact Width 和 Regular Height 的设定，配合上 AutoLayout 来进行布局。
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通知只在主线程发送。
在init中注册，在dealloc中注销。
ghthouse是一个很好的错误追踪工具。OmniOutliner，我在这上面可以找到一堆事情去做。
如果你崩溃了，最好使用僵尸Zombies工具。
真实的代码质量远比别人怎么看我更重要。
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The operation couldn’t be completed
退出Xcode重启
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VVDocumenter-Xcode失效问题解决(如果这么弄都不行, 就删掉重来就OK)
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App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app‘s Info.plist file.
在info.plist中添加
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
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iOS - is missing from working copy
解决方案:
1.打开终端
2.cd 到警告所提示的文件夹下
3.执行命令svn rm --force 丢失文件的名称
4.回车
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批量更新Xcode插件
find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins -name Info.plist -maxdepth 3 | xargs -I{} defaults write {} DVTPlugInCompatibilityUUIDs -array-add `defaults read /Applications/Xcode.app/Contents/Info DVTPlugInCompatibilityUUID`