解決：
Target -> Build Settings -> Build Options set the "Compiler for C/C++/Objective-C" - 選擇"Default compiler (Apple LLVM 5.0)"
2.clang: error: invalid deployment target for -stdlib
解決：
3.ios使用AdMob出錯-[GADObjectPrivate changeState:]: unrecognized selector sent
解決：在Build Settings 中的Other Linker Flags中加入-ObjC
4.'Undefined symbols for architecture i386:
_OBJC_CLASS_$_Reachability", referenced from objc-class-ref inViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)'
解決：問題原因：我xcode版本爲4.5.1,在引入Reachability時候，4.5.1默認沒有勾選targert，所以導致上述錯誤。
5.ios6.0 storyboard編繹出錯：'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate
解決：storyboard or XIB tonot use Autolayout
6.使用SDWebImage 第三方庫出錯
Undefined symbols for architecture i386: "_OBJC_CLASS_$_MKAnnotationView", referenced from: l_OBJC_$_CATEGORY_MKAnnotationView_$_WebCache in MKAnnotationView+WebCache.o "_CGImageSourceCreateIncremental", referenced from: -[SDWebImageDownloader connection:didReceiveData:] in SDWebImageDownloader.o "_CGImageSourceUpdateData", referenced from: -[SDWebImageDownloader connection:didReceiveData:] in SDWebImageDownloader.o "_CGImageSourceCopyPropertiesAtIndex", referenced from: -[SDWebImageDownloader connection:didReceiveData:] in SDWebImageDownloader.o "_CGImageSourceCreateImageAtIndex", referenced from: -[SDWebImageDownloader connection:didReceiveData:] in SDWebImageDownloader.o "_kCGImagePropertyPixelHeight", referenced from: -[SDWebImageDownloader connection:didReceiveData:] in SDWebImageDownloader.o "_kCGImagePropertyPixelWidth", referenced from: -[SDWebImageDownloader connection:didReceiveData:] in SDWebImageDownloader.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)
解決：加入 MapKit 和 ImageIO
7.錯誤提示：* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '* -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'
問題出現在語句：
[saveArray addObject:[NSNumber numberWithInt:saveNum]];
可變的方法發送給一個不可變的對象
ps:@property(nonatomic,retain) NSMutableArray * saveArray;
前面已經賦值：
NSMutableArray *array = [[NSMutableArray alloc] init];
self.saveArray = array;
[array release];
解決方法：
NSMutableArray *mutaArray = [[NSMutableArray alloc] init];
[mutaArray addObjectsFromArray:saveArray];
[mutaArray addObject:[NSNumber numberWithInt:saveNum]];
self.saveArray = mutaArray
[mutaArray release];
8.build 出現Dependency Analysis Error，Product.app出錯，解決方法
Unable to run command ‘Cpresource Product.app' - this target might include its own product.
解決方法：
TARGETS - Build Phases－Copy Bundle Resources－把Product.app刪掉
9.UIPopoverController在Arc中編繹crash解決方法
- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
self.popViewPop = nil;
}
10.上傳出現問題
ERROR ITMS-9000: "this bundle is invalid. armv7s are required to include armv7 architecture." at SoftwareAssets/SoftwareAsset (MZItmspSoftwareAssetPackage).
解決方法：
把Build Active Arch Only參數的值，改爲NO就可以了。
