iOSのインジゲーターができない　Objective−C側

UIActivityIndicatorView.mm

#import <Foundation/Foundation.h>

#ifdef __cplusplus
extern "C" {
#endif
    static UIActivityIndicatorView* spinner = nil;
    void startSpinner() {
        if(spinner == nil) {
            spinner = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 100, 80)];
        }
        [spinner startAnimating];
    }
    void stopSpinner() {
        if(spinner == nil) {
            return;
        }
        if( ![spinner isAnimating] ) {
            return;
        }
        [spinner stopAnimating];
    }
#ifdef __cplusplus
}
#endif