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POUndefined symbols for architecture i386 with custom subclass
 

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  1. POUndefined symbols for architecture i386 with custom subclass
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    <p>I'm new in Xcode development and recently found some weird case during my project development, just wonder what if some one can help me on this, below is the error that I got when I tried to build/run:</p> <pre><code>Ld /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE normal i386 cd /Users/ACE/Documents/Development/Products/ACE4 setenv MACOSX_DEPLOYMENT_TARGET 10.6 setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -L/Users/ACE/Documents/Development/Products/ACE4/Classes/SUP/libs/Debug-iphonesimulator -F/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -filelist "/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Intermediates/ACE.build/Debug-iphonesimulator/ACE Simulator.build/Objects-normal/i386/ACE.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=40200 -lz.1.2.5 -framework Foundation -framework UIKit -framework CoreGraphics -framework AddressBook -framework CoreFoundation -framework QuartzCore -framework Security -lstdc++ -licucore.A -lclientrt -lMO -lSUPObj -framework MapKit -o /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE Undefined symbols for architecture i386: "_OBJC_CLASS_$_TransportMAPView", referenced from: objc-class-ref in TransportViewController.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) </code></pre> <p>this error always appear when I tried to create an object using my custom class which is subclass from UIViewController</p> <pre><code>CustomViewController *customView = [[CustomViewController alloc] init]; </code></pre> <p>and the weird thing is the error will gone and work perfectly if I use UIViewController directly</p> <pre><code>UIViewController *customView = [[UIViewController alloc] init]; </code></pre> <p>below is the other error when I use custom class from UIButton:</p> <pre><code>Ld /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE normal i386 cd /Users/ACE/Documents/Development/Products/ACE4 setenv MACOSX_DEPLOYMENT_TARGET 10.6 setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -L/Users/ACE/Documents/Development/Products/ACE4/Classes/SUP/libs/Debug-iphonesimulator -F/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -filelist "/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Intermediates/ACE.build/Debug-iphonesimulator/ACE Simulator.build/Objects-normal/i386/ACE.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=40200 -lz.1.2.5 -framework Foundation -framework UIKit -framework CoreGraphics -framework AddressBook -framework CoreFoundation -framework QuartzCore -framework Security -lstdc++ -licucore.A -lclientrt -lMO -lSUPObj -framework MapKit -o /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE Undefined symbols for architecture i386: "_OBJC_CLASS_$_AceButton", referenced from: objc-class-ref in TransportViewController.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) </code></pre> <p>and this is my custom class:</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface AceButton : UIButton{ NSString *identifier; } @property(nonatomic,retain) NSString *identifier; @end </code></pre> <p>in one of my View Controller method viewDidLoad()</p> <pre><code>AceButton *button1 = [[AceButton alloc] initWithFrame:frame]; </code></pre>
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    1. COI don't know what it is, but you should look at your CustomViewController. I would comment some things out and see if the error still appears. So you can slowly isolate the source of your error.
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