返回按钮设置

基础类方法：返回按钮设置

//返回按钮
+ (void)setNavigationBackItem:(UIViewController *)viewController
{
    UIButton *back_btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [back_btn.titleLabel setFont:[UIFont boldSystemFontOfSize:13]];
    [back_btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    //特殊页面，特殊处理
    if([viewController isKindOfClass:[ForeignExchangeVC class]] || [viewController isKindOfClass:[MetalMainViewController class]])
    {
        [back_btn setBackgroundImage:[UIImage imageNamed:@"arrow_02"] forState:UIControlStateNormal];
        [back_btn setBackgroundImage:[UIImage imageNamed:@"arrow_02_p"] forState:UIControlStateHighlighted];
    }
    else
    {
        [back_btn setImage:[UIImage imageNamed:@"btn_fanhui.png"] forState:UIControlStateNormal];
        [back_btn setImage:[UIImage imageNamed:@"btn_fanhui_P.png"] forState:UIControlStateNormal];
    }

    [back_btn setImageEdgeInsets:UIEdgeInsetsMake(0, -10, 0, 0)];
    [back_btn setFrame:CGRectMake(0, 0, 25, 25)];
    
    SEL backClick = NSSelectorFromString(@"backView:");
    [back_btn addTarget:viewController action:backClick forControlEvents:UIControlEventTouchUpInside];
    
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:back_btn];

    if([viewController isKindOfClass:[WebViewController class]] || [viewController isKindOfClass:[LoginWebVC class]])
    {  //网址页面 加关闭
        UIButton *itemBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        itemBtn.tag = Tag_WebVC_CloseBtn;
        itemBtn.frame =CGRectMake(10, 10, 24, 24);

        [itemBtn setBackgroundImage:[UIImage imageNamed:@"btngb"] forState:UIControlStateNormal];
        [itemBtn setBackgroundImage:[UIImage imageNamed:@"btngb_p"] forState:UIControlStateHighlighted];
        [itemBtn addTarget:viewController action:backClick forControlEvents:UIControlEventTouchUpInside];

        UIBarButtonItem *clsoeItem = [[UIBarButtonItem alloc] initWithCustomView:itemBtn];
        [viewController.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects:backItem,clsoeItem,nil]];

        return;
    }

    [viewController.navigationItem setLeftBarButtonItem:backItem];
}