網(wǎng)上已經(jīng)很多適配文章了咖祭，這里說一下我們項目遇到、而網(wǎng)文遺漏一些的iOS11蔫骂、iPhoneX適配問題么翰。

1.缺失 iPhone X 尺寸的啟動圖，導(dǎo)致應(yīng)用起來后辽旋，頂部和底部有大片黑邊浩嫌。提供一個1125*2436尺寸的啟動圖即可檐迟；

2.導(dǎo)航欄后退按鈕樣式怪異。下圖中前者是iOS11前的效果码耐，后者是iOS11后的追迟。

正常后退按鈕效果.png

iOS11回退按鈕.png

解決辦法：增加ViewController的category并實(shí)現(xiàn)以下方法，在進(jìn)入ViewController 前調(diào)用 configureBackBarButtonItemWithNormalImage:hilightedImage:

- (void)configureBackBarButtonItemWithNormalImage:(UIImage *)normalImg hilightedImage:(UIImage *)hlImg
{
    // iOS 11.0 前后導(dǎo)航欄的UI結(jié)構(gòu)發(fā)生很大變化骚腥，對于返回按鈕的實(shí)現(xiàn)方式也是不同
    if (@available(iOS 11.0, *)) {
        // iOS 11.0 以后的處理方式
        UIImage *backButtonImage = [normalImg?:hlImg imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        self.navigationController.navigationBar.backIndicatorImage = backButtonImage;
        self.navigationController.navigationBar.backIndicatorTransitionMaskImage = backButtonImage;

        UIBarButtonItem *returnButtonItem = [[UIBarButtonItem alloc] initWithCustomView:[UIView new]];
        self.navigationItem.backBarButtonItem = returnButtonItem;

    } else {
        // iOS 11.0 前處理方式
        UIBarButtonItem *returnButtonItem = [[UIBarButtonItem alloc]
                                             initWithTitle:@""
                                             style:UIBarButtonItemStylePlain
                                             target:nil
                                             action:nil];
        
        UIImage *realNormalImg = normalImg?:hlImg;
        UIImage *realHighlightedImg = hlImg?:realNormalImg;
        if (realNormalImg) {
            [returnButtonItem setBackButtonBackgroundImage:[realNormalImg resizableImageWithCapInsets:UIEdgeInsetsMake(0, realNormalImg.size.width, 0, 0)]
                                                  forState:UIControlStateNormal
                                                barMetrics:UIBarMetricsDefault];
        }
        
        if (realHighlightedImg) {
            [returnButtonItem setBackButtonBackgroundImage:[realHighlightedImg resizableImageWithCapInsets:UIEdgeInsetsMake(0, realNormalImg.size.width, 0, 0)]
                                                  forState:UIControlStateHighlighted
                                                barMetrics:UIBarMetricsDefault];
        }
        
        [returnButtonItem setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];
        self.navigationItem.backBarButtonItem = returnButtonItem;
    }
}

3.leftBarButtonItem 距離屏幕左邊太寬敦间。

iOS11 leftBarButtonItem 效果.png

這個問題在iOS 11 以下可以通過設(shè)置一個負(fù)數(shù) space 的 barItem 來縮減間隙。但是iOS 11 以后失效了束铭。對比網(wǎng)上其他人的方法廓块，我使用另一種方法，主要思路是使用 initWithCustomView: 方法契沫，把操作按鈕包裝成 UIBarButtonItem带猴，設(shè)置UIButton 的contentHorizontalAlignment為Left。但但但這個方法有一個問題就是在 iOS11 leftBarItem 距離左邊永遠(yuǎn)存在16pt的大小懈万，即使你可能通過contentInsets可以把圖片往左邊靠拴清，但實(shí)際上他的frame依然沒改變，這個16pt的間隙是無法點(diǎn)擊的会通。

- (UIBarButtonItem *)createBackBarButtonItemWithActionBlock:(void(^)(id sender))actionBlock
{
    return [self createLeftBarButtonItemWithIconImage:[[UIImage imageNamed:@"back_gold"] imageByTintColor:[UIColor whiteColor]] itemWidth:30 actionBlock:actionBlock];
}

- (UIBarButtonItem *)createCloseBarButtonItemWithActionBlock:(void(^)(id sender))actionBlock
{
    return [self createLeftBarButtonItemWithIconImage:[[UIImage imageNamed:@"close_gold_no_edge"] imageByTintColor:[UIColor whiteColor]] itemWidth:30 actionBlock:actionBlock];
}

- (UIBarButtonItem *)createLeftBarButtonItemWithIconImage:(UIImage*)iconImage
                                                itemWidth:(CGFloat)itemWidth
                                              actionBlock:(void(^)(id sender))actionBlock
{
    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, itemWidth, 30)];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = contentView.bounds;
    [button setTitle:nil forState:UIControlStateNormal];
    [button setImage:iconImage forState:UIControlStateNormal];
    [button setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
    
    if (actionBlock) {
        [button setBlockForControlEvents:UIControlEventTouchUpInside block:actionBlock];
    }
    [contentView addSubview:button];
    
    UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:contentView];
    return barButtonItem;
}

UIBarButtonItem *closeItem = [self createCloseBarButtonItemWithActionBlock:^(id sender) {
          // TODO something
            }];
UIBarButtonItem *backItem = [self createBackBarButtonItemWithActionBlock:^(id sender) {
                // TODO something
            }];
self.navigationItem.leftBarButtonItems = @[backItem,closeItem];

適配后的效果.png

參考鏈接：
https://juejin.im/entry/59bf88856fb9a00a5474e394
http://blog.csdn.net/csdnnews/article/details/78127641
http://www.10tiao.com/html/216/201709/2652552758/2.html