Question

我在Xcode上有这些消息

duplicate symbol _OBJC_IVAR_$_Cars._color in:
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/Cars.o
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/SpriteSlider.o
duplicate symbol _OBJC_IVAR_$_Cars._brand in:
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/Cars.o
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/SpriteSlider.o
duplicate symbol _OBJC_IVAR_$_Cars._place in:
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/Cars.o
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/SpriteSlider.o
duplicate symbol _OBJC_IVAR_$_Cars._state in:
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/Cars.o
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/SpriteSlider.o
duplicate symbol _OBJC_CLASS_$_Cars in:
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/Cars.o
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/SpriteSlider.o
duplicate symbol _OBJC_METACLASS_$_Cars in:
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/Cars.o
    /Users/myUsername/Library/Developer/Xcode/DerivedData/myApp-ecspkaggqtvfeuglkpunmntelswf/Build/Intermediates/myApp.build/Debug-iphoneos/myApp.build/Objects-normal/armv7/SpriteSlider.o
ld: 6 duplicate symbols for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

它提到的重复符号不重复。这些是在我的Cars类中声明的四个属性，如下所示：

@property (nonatomic, copy) void (^color)();
@property (nonatomic, copy) void (^brand)(Cars *oneCar, NSSet *touches);
@property (nonatomic, strong) NSString *place;
@property (nonatomic, assign) NSString *state;

另一类SpriteSlider没有这些属性。它怎么可能重复？

我如何发现问题。 Xcode可以提供更详细的消息吗？感谢

不，相同的类在构建阶段没有被编译两次。

Answer 1

您错误地将Cars class .m文件导入SpriteSlider.m文件。将其切换为“#import "Cars.h"”即可完成设置。

欢迎你！

我在看什么？重复的符号？

1 个答案: