NnavigationItem

把UIButton包装成UIBarButtonItem.就导致按钮点击区域扩大

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

    [btn setImage:[UIImage imageNamed:@"nav_item_game_icon"] forState:UIControlStateNormal];

    [btn setImage:[UIImage imageNamed:@"nav_item_game_click_icon"] forState:UIControlStateHighlighted];

    [btn sizeToFit];

    [btn addTarget:self action:@selector(game) forControlEvents:UIControlEventTouchUpInside];

 

    UIView *containView = [[UIView alloc]initWithFrame:btn.bounds];

    [containView addSubview:btn];

 

    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:containView];