iOS之iOS11、iPhone X、Xcode9 适配指南

// 有些界面以下使用代理方法来设置，发现并没有生效
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section;
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section;
// 这样的原理是因为之前只是实现了高度的代理方法，却没有实现View的代理方法，iOS10及以前这么写是没问题的，iOS11开启了行高估算机制引起的bug，因此有以下几种解决方法：
// 解决方法一：添加实现View的代理方法，只有实现下面两个方法，方法 (CGFloat)tableView: heightForFooterInSection: 才会生效
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
    return nil;
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    return nil;
}
// 解决方法二：直接使用tableView属性进行设置,修复该UI错乱
self.tableView.sectionHeaderHeight = 0;
self.tableView.sectionFooterHeight = 5;
[_optionTableView setContentInset:UIEdgeInsetsMake(-35, 0, 0, 0)];
// 解决方法三：添加以下代码关闭估算行高
self.tableView.estimatedRowHeight = 0;
self.tableView.estimatedSectionHeaderHeight = 0;
self.tableView.estimatedSectionFooterHeight = 0;

if ([UIDevice currentDevice].systemVersion.floatValue >= 11.0) {
    make.edges.equalTo(self.view.safeAreaInsets);
} else {
    make.edges.equalTo(self.view);
}

// 0.83能保证压缩前后图片大小是一致的
// 造成不一致的原因是图片的bitmap一个是8位的，一个是16位的
imageData = UIImageJPEGRepresentation([UIImage imageWithData:imageData], 0.83);

// A view controller that will be shown inside of a navigation controller can assign a UISearchController to this property to display the search controller’s search bar in its containing navigation controller’s navigation bar.
@property (nonatomic, retain, nullable) UISearchController *searchController API_AVAILABLE(ios(11.0)) API_UNAVAILABLE(tvos);
// If this property is true (the default), the searchController’s search bar will hide as the user scrolls in the top view controller’s scroll view. If false, the search bar will remain visible and pinned underneath the navigation bar.
@property (nonatomic) BOOL hidesSearchBarWhenScrolling API_AVAILABLE(ios(11.0)) API_UNAVAILABLE(tvos);

// 测试代码
#import NSMutableString *resultStr = [NSMutableString string];
//获取指定类的Ivar列表及Ivar个数
unsigned int count = 0;
Ivar *member = class_copyIvarList([[application valueForKeyPath:@"_statusBar"] class], &count);
     
for(int i = 0; i < count; i++){
    Ivar var = member[i];
    //获取Ivar的名称
    const char *memberAddress = ivar_getName(var);
    //获取Ivar的类型
    const char *memberType = ivar_getTypeEncoding(var);
    NSString *str = [NSString stringWithFormat:@"key = %s             type = %s \n",memberAddress,memberType];
      [resultStr appendString:str];
}
NSLog(@"%@", resultStr);

// 其他版本的手机
key = _inProcessProvider            type = @""
key = _showsForeground              type = B
key = _backgroundView               type = @"UIStatusBarBackgroundView"
key = _doubleHeightLabel            type = @"UILabel"
key = _doubleHeightLabelContainer   type = @"UIView"
key = _currentDoubleHeightText      type = @"NSString"
key = _currentRawData               type = {超长。。}
key = _interruptedAnimationCompositeViews  type = @"NSMutableArray"
key = _newStyleBackgroundView       type = @"UIStatusBarBackgroundView"
key = _newStyleForegroundView       type = @"UIStatusBarForegroundView"
key = _slidingStatusBar             type = @"UIStatusBar"
key = _styleAttributes              type = @"UIStatusBarStyleAttributes"
key = _waitingOnCallbackAfterChangingStyleOverridesLocally  type = B
key = _suppressGlow                 type = B
key = _translucentBackgroundAlpha   type = d
key = _showOnlyCenterItems          type = B
key = _foregroundViewShouldIgnoreStatusBarDataDuringAnimation  type = B
key = _tintColor                    type = @"UIColor"
key = _lastUsedBackgroundColor      type = @"UIColor"
key = _nextTintTransition           type = @"UIStatusBarStyleAnimationParameters"
key = _overrideHeight               type = @"NSNumber"
key = _disableRasterizationReasons  type = @"NSMutableSet"
key = _timeHidden                   type = B
key = _statusBarWindow              type = @"UIStatusBarWindow"
// iPhone X
key = _statusBar ; type = @"_UIStatusBar"
// 因此可见iPhone X的状态栏是多嵌套了一层，多取一次即可，最终适配代码为：
NSArray *children;
// 不能用 [[self deviceVersion] isEqualToString:@"iPhone X"] 来判断，因为iPhone X 的模拟器不会返回 iPhone X
    if ([[application valueForKeyPath:@"_statusBar"] isKindOfClass:NSClassFromString(@"UIStatusBar_Modern")]) {
        children = [[[[application valueForKeyPath:@"_statusBar"] valueForKeyPath:@"_statusBar"] valueForKeyPath:@"foregroundView"] subviews];
    } else {
        children = [[[application valueForKeyPath:@"_statusBar"] valueForKeyPath:@"foregroundView"] subviews];
    }

NSArray *typeStrings2G = @[CTRadioAccessTechnologyEdge,
                               CTRadioAccessTechnologyGPRS,
                               CTRadioAccessTechnologyCDMA1x];
     
    NSArray *typeStrings3G = @[CTRadioAccessTechnologyHSDPA,
                               CTRadioAccessTechnologyWCDMA,
                               CTRadioAccessTechnologyHSUPA,
                               CTRadioAccessTechnologyCDMAEVDORev0,
                               CTRadioAccessTechnologyCDMAEVDORevA,
                               CTRadioAccessTechnologyCDMAEVDORevB,
                               CTRadioAccessTechnologyeHRPD];
     
    NSArray *typeStrings4G = @[CTRadioAccessTechnologyLTE];
    // 该 API 在 iOS7 以上系统才有效
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
        CTTelephonyNetworkInfo *teleInfo= [[CTTelephonyNetworkInfo alloc] init];
        NSString *accessString = teleInfo.currentRadioAccessTechnology;
        if ([typeStrings4G containsObject:accessString]) {
            NSLog(@"4G网络");
        } else if ([typeStrings3G containsObject:accessString]) {
            NSLog(@"3G网络");
        } else if ([typeStrings2G containsObject:accessString]) {
            NSLog(@"2G网络");
        } else {
            NSLog(@"未知网络");
        }
    } else {
        NSLog(@"未知网络");
    }

CGRectGetHeight([UIApplication sharedApplication].statusBarFrame)

if ([deviceString isEqualToString:@"iPhone10,1"])   return @"国行(A1863)、日行(A1906)iPhone 8";
if ([deviceString isEqualToString:@"iPhone10,4"])   return @"美版(Global/A1905)iPhone 8";
if ([deviceString isEqualToString:@"iPhone10,2"])   return @"国行(A1864)、日行(A1898)iPhone 8 Plus";
if ([deviceString isEqualToString:@"iPhone10,5"])   return @"美版(Global/A1897)iPhone 8 Plus";
if ([deviceString isEqualToString:@"iPhone10,3"])   return @"国行(A1865)、日行(A1902)iPhone X";
if ([deviceString isEqualToString:@"iPhone10,6"])   return @"美版(Global/A1901)iPhone X";