iOS 11導航欄自定義UIBarButtonItem點擊區域變小

參考 stackoverflow

這里是為在xcode9 iOS 11之前我們是這樣寫的:

    UIImage *image = [UIImage imageNamed:@"圖片名"];
    UIImageView *backImageView = [[UIImageView alloc]initWithImage:image];
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc]initWithCustomView:backImageView];

但是在xcode9 iOS 11必須設置frame,點擊區域才會變大

• 方法一 設置frame

    UIImage *image = [UIImage imageNamed:@"圖片名"];
    UIImageView *backImageView = [[UIImageView alloc]initWithImage:image];
    backImageView.frame = CGRectMake(0, 0, 44, 44);
    backImageView.contentMode = UIViewContentModeLeft;
    UIBarButtonItem *leftItem = [[UIBarButtonItem alloc]initWithCustomView:backImageView];

• 方法二 參考stackoverflow

xcode9 iOS 11之后UINavigationBar現在是使用Auto Layout來來布局其子視圖,隨意我們應該圖像添加寬度約束

• Swift添加約束

import UIKit

extension UIView {
    func applyNavBarConstraints(size: (width: Float, height: Float)) {
        let widthConstraint = self.widthAnchor.constraint(equalToConstant: width)
        let heightConstraint = self.heightAnchor.constraint(equalToConstant: height)
        heightConstraint.isActive = true
        widthConstraint.isActive = true
    }
}

// Usage
button.applyNavBarConstraints(size: (width: 33, height: 33))

• OC版添加約束

//  UIView+Navbar.h

#import <UIKit/UIKit.h>

@interface UIView (Navbar)

- (void)applyNavBarConstraints:(CGFloat)width height:(CGFloat)height;

@end

//----------

//  UIView+Navbar.m

#import "UIView+Navbar.h"

@implementation UIView (Navbar)

- (void)applyNavBarConstraints:(CGFloat)width height:(CGFloat)height
{
    if (width == 0 || height == 0) {
        return;
    }

    NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:height];
    NSLayoutConstraint *widthConstraint = [NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:width];
    [heightConstraint setActive:TRUE];
    [widthConstraint setActive:TRUE];
}

//----------

// Usage :-
[button applyNavBarConstraints:33 height:33];

automaticallyAdjustsScrollViewInsets

automaticallyAdjustsScrollViewInsets屬性被廢棄了，頂部就多了一定的inset

解決方法: 都可以寫成宏

1. 必須在xcode9上運行

if (@available(iOS 11.0, *)) { 
    scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever; 
}else{ 
    controller.automaticallyAdjustsScrollViewInsets = NO;
}

2.可以在xcode9以下版本運行

#define adjustsScrollViewInsets_NO(scrollView,controller) \
do { \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
if ([UIScrollView instancesRespondToSelector:NSSelectorFromString(@"setContentInsetAdjustmentBehavior:")]) {\
[scrollView   performSelector:NSSelectorFromString(@"setContentInsetAdjustmentBehavior:") withObject:@(2)];\
} else {\
controller.automaticallyAdjustsScrollViewInsets = NO;\
}\
_Pragma("clang diagnostic pop") \
} while (0)

tableview問題

• iOS 11中如果不實現-tableView: viewForFooterInSection: 和 -tableView: viewForHeaderInSection:，那么-tableView: heightForHeaderInSection:和 - tableView: heightForFooterInSection:不會被調用

iOS 11修改tabbar的高度

iOS 11之前我們項目中是這樣修改tabBar的高度的;

//自定義TabBar高度
- (void) viewWillLayoutSubviews {

    [super viewWillLayoutSubviews];
    CGRect tabFrame = self.tabBar.frame;
    tabFrame.size.height = 60;
    tabFrame.origin.y = self.view.frame.size.height - 60;
    self.tabBar.frame = tabFrame;
    self.tabBar.barStyle = UIBarStyleBlack;
}

升級iOS 11之后發現控制器跳轉的時候tabbar隱藏有問題,隱藏有延遲,往往是進入了新控制器后tabbar延遲隱藏!一直以為是hidesBottomBarWhenPushed設置時機的問題,糾結了一天.
在stackoverflow上看到一個關于Change UITabBar height的問題!里面有幾個關于XCode 9.0 iOS 11的解決方案!

• 嘗試方案一:

  
  

將viewWillLayoutSubviews替換為viewDidLayoutSubviews嘗試后 還是有問題

• 嘗試方案二: 重寫tabbar的sizeThatFits

  
  

這個方案是可以的

@property(nonatomic,readonly) UITabBar *tabBar 是 readonly的! 我們可以通過KVC設置
[self setValue:自定義tabbar forKey:@"tabBar"];

iOS 11 WKWebView崩潰

崩潰信息:通過全局斷點崩潰在下面
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler中的decisionHandler
解決方案: 保證了單次LoadRequest只執行一次decisionHandler()

- (void)webView:(WKWebView *)webView
decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction
decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    if (webView != _webView) { return; }
    NSURL *url = navigationAction.request.URL;
    __strong typeof(_webViewDelegate) strongDelegate = _webViewDelegate;

    if ([_base isCorrectProcotocolScheme:url]) {
        if ([_base isBridgeLoadedURL:url]) {
            [_base injectJavascriptFile];
        } else if ([_base isQueueMessageURL:url]) {
            [self WKFlushMessageQueue];
        } else {
            [_base logUnkownMessage:url];
        }
        **decisionHandler(WKNavigationActionPolicyCancel);     //  executed**
    }
    
    if (strongDelegate && [strongDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) {
        **[_webViewDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler];          //  executed** 
    } else {
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

或者在合適的地方return,避免重復調用decisionHandler

參考

參考
https://github.com/marcuswestin/WebViewJavascriptBridge/issues/278
iOS11 Xcode9 WKWebView崩潰問題解決方案

Marketing Icon

Missing Marketing Icon. iOS Apps must include a 1024x1024px Marketing Icon in PNG format. Apps that do not include the Marketing Icon cannot be submitted for App Review or Beta App Review.

9月份上傳的時候,沒有1024*1024的營銷圖標只是有警告,現在上傳的時候也是有警告的,但是提交審核的時候直接不能提交審核!

解決iOS11刷新tableview會出現漂移的現象

_tableView.estimatedRowHeight = 0;  
_tableView.estimatedSectionHeaderHeight = 0; 
_tableView.estimatedSectionFooterHeight = 0;