A-生成Button，绑定事件和图片

- (UIButton*)buildButton:(CGRect)frame
            normalImgStr:(NSString*)normalImgStr
         highlightImgStr:(NSString*)highlightImgStr
          selectedImgStr:(NSString*)selectedImgStr
                  action:(SEL)action
              parentView:(UIView*)parentView {
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = frame;
    if (normalImgStr.length > 0)
    {
        [btn setImage:[UIImage imageNamed:normalImgStr] forState:UIControlStateNormal];
    }
    if (highlightImgStr.length > 0)
    {
        [btn setImage:[UIImage imageNamed:highlightImgStr] forState:UIControlStateHighlighted];
    }
    if (selectedImgStr.length > 0)
    {
        [btn setImage:[UIImage imageNamed:selectedImgStr] forState:UIControlStateSelected];
    }
    [btn addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];
    
    [parentView addSubview:btn];
    
    return btn;
}

　　

UIButton * btn = [self buildButton:CGRectMake(fBtnX, 8, 30, 30)
                              normalImgStr:[normalArr objectAtIndex:i]
                           highlightImgStr:[highlightArr objectAtIndex:i]
                            selectedImgStr:[selectedArr objectAtIndex:i]
                                    action:NSSelectorFromString([actionArr objectAtIndex:i])
                                parentView:parent];
        btn.showsTouchWhenHighlighted = YES;
        [_cameraBtnSet addObject:btn];

　　

//全部图片
    NSMutableArray *normalArr = [[NSMutableArray alloc] initWithObjects:@"explore_cancel", @"camera_line_w.png", @"camera_change_w.png", @"camera_flash_w.png", nil];
    
    //下边框
    NSMutableArray *highlightArr = [[NSMutableArray alloc] initWithObjects:@"close_cha_h.png", @"", @"", @"", nil];
    
    //选中后变色图片
    NSMutableArray *selectedArr = [[NSMutableArray alloc] initWithObjects:@"", @"camera_line_h.png", @"camera_change_h.png", @"", nil];
    
    //绑定事件
    NSMutableArray *actionArr = [[NSMutableArray alloc] initWithObjects:@"dismissBtnPressed:", @"gridBtnPressed:", @"switchCameraBtnPressed:", @"flashBtnPressed:", nil];