1、UITextField修改placeholder顏色

私有屬性_placeholderLabel 被禁止訪問(wèn)了

Swift：
textField.setValue(.white, forKeyPath: "_placeholderLabel.textColor")
修改為
let attributedString = NSMutableAttributedString(string: "輸入", attributes: [NSAttributedString.Key.foregroundColor : BaseColor.PlaceHolderColor])
textField.attributedPlaceholder = attributedString

OC：
[textField setValue:[UIColor white] forKeyPath:@"_placeholderLabel.textColor"];
修改為
textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"輸入" attributes:@{NSForegroundColorAttributeName: [UIColor red]}];

2、present控制器模態(tài)跳轉(zhuǎn)樣式

Swift：
self.modalPresentationStyle = .fullScreen
 
OC：
self.modalPresentationStyle = UIModalPresentationFullScreen;

3、全局關(guān)閉暗黑模式

在info.plist中添加User Interface Style，設(shè)置為L(zhǎng)ight
或者：
if(@available(iOS 13.0,*)) {
self.window.overrideUserInterfaceStyle = UIUserInterfaceStyleLight;
}

4、DeviceToken獲取方式

if (![deviceToken isKindOfClass:[NSData class]]) return;
const unsigned *tokenBytes = (const unsigned *)[deviceToken bytes];
NSString *hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                          ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                          ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                          ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];
NSLog(@"deviceToken:%@",hexToken);

5、廢棄的 LaunchImage

從2020年4月開始，所有使? iOS13 SDK的App將必須使用LaunchScreen

6、UISegmentedControl變化

iOS13默認(rèn)樣式是白底黑字，不能通過(guò)tintColor修改選中背景顏色，新增了selectedSegmentTintColor屬性用以修改選中的顏色

7、CNCopyCurrentNetworkInfo

iOS13 以后只有開啟了 Access WiFi Information capability，才能獲取到SSID和BSSID，應(yīng)用還需要符合下列三項(xiàng)條件中的至少一項(xiàng)才能得到正確的值：
1、獲得定位服務(wù)權(quán)限。
2、使用NEHotspotConfiguration來(lái)配置 WiFi 網(wǎng)絡(luò)的應(yīng)用。
3、目前正處于啟用狀態(tài)的 VPN 應(yīng)用。

Swift:
func getWifiName() -> String? {
    
    var wifiName = ""
    let wifiInterfaces = CNCopySupportedInterfaces()
    if wifiInterfaces == nil {
        return nil
    }
    
    let interfaceArr = CFBridgingRetain(wifiInterfaces!) as! Array<String>
    
    if interfaceArr.count > 0 {
        
        let interfaceName = interfaceArr[0] as CFString
        let ussafeInterfaceData = CNCopyCurrentNetworkInfo(interfaceName)
        
        if (ussafeInterfaceData != nil) {
            
            let interfaceData = ussafeInterfaceData as! Dictionary<String, Any>
            wifiName = interfaceData["SSID"]! as! String
        }
    }
    return wifiName
}

OC:
-(void)getWiFiName {
    
    NSString *wifiName = nil;
    CFArrayRef wifiInterfaces = CNCopySupportedInterfaces();
      if (!wifiInterfaces) {
        return nil;
    }
    NSArray *interfaces = (__bridge NSArray *)wifiInterfaces;
    for (NSString *interfaceName in interfaces) {
        CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName));
     
        if (dictRef) {
            NSDictionary *networkInfo = (__bridge NSDictionary *)dictRef;
            NSLog(@"network info -> %@", networkInfo);
            wifiName = [networkInfo objectForKey:(__bridge NSString *)kCNNetworkInfoKeySSID];
            CFRelease(dictRef);
            }
        }
        CFRelease(wifiInterfaces);
        return wifiName;
    }
}

8、廢棄UIWebView，WKWebView 中測(cè)量頁(yè)面內(nèi)容高度的方式變更

<iOS13
document.body.scrollHeight
>=iOS13
document.documentElement.scrollHeight

9、UISearchBar 黑線處理導(dǎo)致崩潰

之前為了處理搜索框的黑線問(wèn)題，通常會(huì)遍歷 searchBar 的 subViews，找到并刪除 UISearchBarBackground，在 iOS13 中這么做會(huì)導(dǎo)致 UI 渲染失敗，然后直接崩潰
解決辦法：設(shè)置 UISearchBarBackground 的 layer.contents 為 nil
for (UIView *view in _searchBar.subviews.lastObject.subviews) {
    if ([view isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
        view.layer.contents = nil;
        break;
    }
} 

//崩潰 api
UITextField *textField = [searchBar valueForKey:@"_searchField"];
//方案1：使用 iOS 13 的新屬性 searchTextField
searchBar.searchTextField.placeholder = @"search";
//方案2：遍歷獲取指定類型的屬性
- (UIView *)findViewWithClassName:(NSString *)className inView:(UIView *)view{
    Class specificView = NSClassFromString(className);
    if ([view isKindOfClass:specificView]) {
        return view;
    }

    if (view.subviews.count > 0) {
        for (UIView *subView in view.subviews) {
            UIView *targetView = [self findSpecificView:className inView:subView];
            if (targetView != nil) {
                return targetView;
            }
        }
    }
    
    return nil;
}
// 調(diào)用方法
UITextField *textField = [self findViewWithClassName:@"UITextField" inView:_searchBar];

//崩潰 api
[searchBar setValue:@"取消" forKey:@"_cancelButtonText"];
// 替代方案，用同上的方法找到子類中 UIButton 類型的屬性，然后設(shè)置其標(biāo)題
UIButton *cancelButton = [self findViewWithClassName:NSStringFromClass([UIButton class]) inView:searchBar];
[cancelButton setTitle:@"取消" forState:UIControlStateNormal];

10、iOS13中使用UISearchDisplayController崩潰

使用 UISearchController 替換 UISearchBar + UISearchDisplayController組合

11、UITabbar無(wú)法通過(guò)設(shè)置shadowImage去掉上面的線

Swift:
if #available(iOS 13, *) {
  let appearance = self.tabBar.standardAppearance.copy()
  appearance.backgroundImage = UIImage()
  appearance.shadowImage = UIImage()
  appearance.shadowColor = .clear
  self.tabBar.standardAppearance = appearance
} else {
  self.tabBar.shadowImage = UIImage()
  self.tabBar.backgroundImage = UIImage()
}

OC:
if (@available(iOS 13.0, *)) {
    UITabBarAppearance* appearance =  self.tabBar.standardAppearance.copy;
    appearance.backgroundImage = [UIImage new];
    appearance.shadowImage = [UIImage new];
    appearance.shadowColor = [UIColor clearColor];
    // Title adjustment
    appearance.stackedLayoutAppearance.normal.titlePositionAdjustment = UIOffsetMake(0, -12);
    self.tabBar.standardAppearance = appearance;
} else {
    self.tabBar.shadowImage = [UIImage new];
    self.tabBar.backgroundImage = [UIImage new];
}

12、iOS13菜單欄文字顏色變藍(lán)問(wèn)題

if #available(iOS 13.0, *) {
    UITabBar.appearance().unselectedItemTintColor = UIColor(hex: 0x888888)
    UITabBar.appearance().tintColor = UIColor(hex: 0x333333)
}