Swift weakSelf写法

类：AVC

#import <UIKit/UIKit.h>

typedef void(^ABlock)(void);

@interface AVC : UIViewController

@property (nonatomic,copy)ABlock aBlock;

@end

引用类：

    @IBActionfunc btnClick(sender: AnyObject) {

        let vc:AVC =AVC()

        vc.aBlock = ({[weakself] in

            let vc0:AVC =AVC()

            self!.navigationController?.pushViewController(vc0, animated:true)

        })

        self.navigationController?.pushViewController(vc, animated:true)

    }