linker command failed with exit code 1 (use -v to see invocation)

不能隨意將全域變數於.m拉出

  int globalSetting = 1;

- (void)viewDidLoad

正確做法
.h

@interface Test : UIViewController
{

  
    int globalSetting ;

    
}
@property (nonatomic,assign) int globalSetting;

.m

 @synthesize globalSetting;