解决方案 - 简书

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ld: warning: embedded dylibs/frameworks only run/supported on iOS 8 or later

原因: framework支持的最低开发环境为8.0，工程却低于8.0
方案: 选低版本开发环境重新编译framework(BuildSettings->iOS Deployment Target->7.0)或者改工程高于8.0

Application Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure

原因: 默认禁止http
方案: Info.plist 添加NSAppTransportSecurity(Dict)--> NSAllowsArbitraryLoads(Bool)

<key>NSAppTransportSecurity</key>
<dict> 
  <key>NSExceptionDomains</key> 
    <dict> 
    <key>域名.com</key> 
    <dict> 
    <!--允许子域名:subdomains--> 
    <key>NSIncludesSubdomains</key> 
    <true/> 
    <!--允许App进行不安全的HTTP请求--> 
    <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key> 
    <true/> 
    <!--在这里声明所支持的 TLS 最低版本--> 
    <key>NSTemporaryExceptionMinimumTLSVersion</key> 
    <string>TLSv1.1</string> 
    </dict> 
  </dict>
</dict>

subsystem: com.apple.UIKit, category:

原因: Xcode8打印过多信息
方案: Product–>Scheme–>Edict Scheme–>Run–>Envlronment Variables –>添加OS_ACTIVITY_MODE值disable

iOS-Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be complet

原因: json数据当中有 \\n \\r \\t 等制表符
方案:

NSString * responseString = [request responseString]; 
responseString = [responseString stringByReplacingOccurrencesOfString:@"\\\\r\\\\n" withString:@""]; 
responseString = [responseString stringByReplacingOccurrencesOfString:@"\\\\n" withString:@""]; 
responseString = [responseString stringByReplacingOccurrencesOfString:@"\\\\t" withString:@""];
// 然后在使用系统自带方法进行JSON字符串解析
[NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableLeaves error:&error];

Masonry崩溃NSAssert(NO, @"attempting to add unsupported attribute: %@", secondViewAttribute)

原因: 布局顺序有问题
方案: 改变参照

CocoaPods 出现Unable to convert Ruby value `"AFNetworking"' into a CFTypeRef

原因: 这是ruby本身bug，升级版本即可
方案: CocoaPods附加

Could not find file: /Users/RainDou/Library/Developer/Xcode/DerivedData/.../Animate.png

原因: 图片后缀png,但只是其他格式改变图片后缀，元数据不是
方案: 将图片真的转化为png格式,而不是改后缀

Assigning to 'id<Delegate>' from incompatible type 'ViewController *const_strong

原因: 设置了delegate = self,但是self没有遵守这个协议
方案: 遵循协议<xxxDelegate>

控制台打印 NSGenericException

原因: 数组操作不当,如for in循环中改变数组自身数据
方案: 禁止在循环中操作数组本身

property follows cocoa naming convention for returning 'owned' objects

原因：命名不规范,属性不能以关键字开头，如alloc，new，copy，mutableCopy
方案：更改命名

SVN Description : The working copy is locked due to a previous error

原因：文件传输未完成时关闭连接容易出现
方案：右击左侧工程目录，点击clean

Invalid pointer dequeued from free list set a breakpoint in malloc_error_break to debug

原因：工程中应用了非RGB图片，导致内存问题
方案：将问题图片替换为sRGB图片

Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer bounds contains NaN: [nan 0; nan 10]'

原因：代码有除以0部分，比如用sizeWithFont方法计算UILabel宽高，NSString为nil的时候，sizeWithFont会除以0了。
方案：做判断

执行reloadData 后UICollectionView的cel.hidden = YES导致cell消失

原因：子线程reload
方案：dispatch_async(dispatch_get_main_queue(), ^{ [self.collectionView reloadData]; });

Assertion failure in -[UICollectionViewData validateLayoutInRect:]

原因：VC中使用两个UICollectionView, reloadData时若数据源个数多于更新之前可能出现Assertion failure
方案：千万不要使用同一个flowLayout

-[__NSArray0 objectForKeyedSubscript:]: unrecognized selector sent to instance 0x7fd4225022c0

原因：数据类型不匹配，把数组当字典用了
方案：添加判断条件

使用WKWebView “OBJC_CLASS$_WKWebView”, referenced from:

原因：没有引入WebKit.framework
方案：在target--build Phases -- Link Banary...添加WebKit.framework

scrollRectToVisible不起作用

原因：可能是contentSize 中width或者height为0
方案：设置非0值

宏定义不识别

原因：xcode没能正确编译
方案：关闭xcode,终端 open /Users/yourname/Library/Developer/Xcode/DerivedData 或者前往该文件夹,删除其子目录

class AVPlayerItem was deallocated while key value observers were still registered with it.

原因：播放失败时可能 self.player.currentItem==nil
方案：

if (self.player && self.player.currentItem)
    {
        [self.player.currentItem removeObserver:self forKeyPath:@"status"];
    }

使用UIImagePickerConroller 设置picker.mediaTypes = @[(NSString *)kUTTypeMovie];
kUTTypeMovie 不识别

原因：没有引入头文件
方案：#import <MobileCoreServices/MobileCoreServices.h>

移除监听者崩溃问题

原因：监听者不存在或者被监听者对象不存在
方案：

 if (self.player && self.player.currentItem)
    {
        @try
        {
            [self.player.currentItem removeObserver:self forKeyPath:@"status"];
        }
        @catch (NSException *exception)
        {
            DDYInfoLog(@"已经移除了监听者");
        }   
    }

push隐藏tabbar，pop回来后tabbar不见了

ViewController *vc = [[ViewController alloc] init];
[self setHidesBottomBarWhenPushed:YES];
[self.navigationController pushViewController:vc animated:YES];

原因：当前控制器调用了隐藏tabbar
方案：[self setHidesBottomBarWhenPushed:YES];改为[vc setHidesBottomBarWhenPushed:YES];

长按手势明明长按一次却执行两次

原因：没有处理手势到底何种状态
方案：

if (longPressGesture.state == UIGestureRecognizerStateBegan) {
    // do something
}else if (longPressGesture.state == UIGestureRecognizerStateEnded){
    // do something
}

reason: 'child view controller:<UICompatibilityInputViewController: 0x1103f9d40>
should have parent view controller:<StopChooser: 0x11083e200> but requested parent is:<UIInputWindowController: 0x110858800>'

原因：添加的inputView不能以 'inputView' 命名，也不能属于任何其他父视图
方案：
mTextField.inputView = mInputVeiw;
[mInputVeiw removeFromSuperview];
[mTextField becomeFirstResponder];

NSTimer 不执行

原因：线程阻塞
方案：

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
        NSTimer* t = [NSTimer scheduledTimerWithTimeInterval:1 target:self  selector:@selector(Reconnect:) userInfo:nil repeats:NO];    
        [[NSRunLoop currentRunLoop] addTimer:t forMode:NSDefaultRunLoopMode];
        [[NSRunLoop currentRunLoop] run]; 
    });

svn 强退后 Previous operation has not finished; run 'cleanup' if it was interrupted.

原因：可能是频繁做了一些改名，文件打开的时候更新或者提交操作，导致svn罢工了
方案：进入工程目录(显示隐藏文件)，找到.svn并进入执行 sqlite3 wc.db "delete from work_queue"。然后执行clean

Your application has presented a UIAlertController (<UIAlertController: 0x7af36380>) of style
UIAlertControllerStyleActionSheet. The modalPresentationStyle of a UIAlertController with this
style is UIModalPresentationPopover. You must provide location information for this popover through the alert
controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a
barButtonItem. If this information is not known when you present the alert controller, you may provide it in
the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.

UIPopoverPresentationController *popover = alertController.popoverPresentationController;
// 需要啥就给他啥
if (popover) {
  popover.sourceView = imageView;
  popover.sourceRect = imageView.bounds;
  popover.permittedArrowDirections = UIPopoverArrowDirectionAny;
  popover.delegate= self;
}

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