1、UINavigationBar
在iOS 15中，UINavigationBar默认为透明。在滑动时会有模糊效果。如果想要一直就是模糊效果，可以通过改变scrollEdgeAppearance属性来实现。
解决办法：
UINavigationBarAppearance*barApp=[[UINavigationBarAppearance alloc]init];
barApp.backgroundEffect=[UIBlurEffect effectWithStyle:UIBlurEffectStyleRegular];
self.navigationBar.scrollEdgeAppearance=barApp;
UINavigationBar、UIToolbar 和 UITabBar 将在你的VC关联滚动视图位于适当的边缘时使用 scrollEdgeAppearance（或者如果您的视图层级结构中没有 UIScrollView，更多内容见下文）。
您必须使用 UIBarAppearance API 来自定义。UIToolbar 和 UITabBar 为此在 iOS 15 中添加了 scrollEdgeAppearance 属性。
解决办法：
object-c:
if(@available(iOS 15.0,*)){
UINavigationBarAppearance*barApp=[UINavigationBarAppearance new];
barApp.backgroundColor=[[UIColor blueColor]colorWithAlphaComponent:0.5];
//图片
// navBarApperance.backgroundImage = [UIImage imageNamed:@"bgImage.png"];
// navBarApperance.backgroundImageContentMode = UIViewContentModeScaleToFill;
NSDictionary *dictM = @{ NSForegroundColorAttributeName:[UIColor blackColor]};
barApp.titleTextAttributes = dictM;
self.navigationController.navigationBar.scrollEdgeAppearance=barApp;
self.navigationController.navigationBar.standardAppearance=barApp;
}
swift:
if #available(iOS 15.0,*) {
let navBarAppecrace = UINavigationBarAppearance()
//颜色// navBarAppecrace.backgroundColor = UIColor.red
//图片 navBarAppecrace.backgroundImage = UIImage.init(named: "bgImage.png")
navBarAppecrace.backgroundImageContentMode = .scaleToFill
navBarAppecrace.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.black]
self.navigationController?.navigationBar.standardAppearance = navBarAppecrace
self.navigationController?.navigationBar.scrollEdgeAppearance = navBarAppecrace
} else {
self.navigationController?.navigationBar.barTintColor = UIColor.red
// self.navigationController?.navigationBar.setBackgroundImage(UIImage.init(named: "bgImage.png"), for: .any, barMetrics: .default)
}
1.1：TabBar
这里我看到好多文章说和navigationbar是一个毛病，背景色和图片设置在iOS 15上面都不会生效，但是我经过测试，oc是没有毛病的！swift语言确实会不生效。为了统一做了如下改动
代码和效果图如下：
object-c:
if (@available(iOS 15.0, *)) {
UITabBarAppearance *tabBarAppearanc = [UITabBarAppearance new];
//颜色 tabBarAppearanc.backgroundColor = [UIColor greenColor];
// //图片// tabBarAppearanc.backgroundImage = [UIImage imageNamed:@"bgImage.png"];
// tabBarAppearanc.backgroundImageContentMode = UIViewContentModeScaleToFill;
NSDictionary *dictM = @{ NSForegroundColorAttributeName:[UIColor redColor]};
tabBarAppearanc.stackedLayoutAppearance.selected.titleTextAttributes = dictM;
// tabBarAppearanc.stackedLayoutAppearance.normal.titleTextAttributes = .....
self.tabBar.scrollEdgeAppearance = tabBarAppearanc;
self.tabBar.standardAppearance = tabBarAppearanc;
} else {
// Fallback on earlier versions
[[UITabBarItem appearance] setTitleTextAttributes:@{ NSForegroundColorAttributeName:[UIColor blackColor]} forState:UIControlStateNormal];
[[UITabBarItem appearance] setTitleTextAttributes:@{ NSForegroundColorAttributeName:[UIColor redColor]} forState:UIControlStateSelected];
//颜色 [[UITabBar appearance] setBarTintColor:[UIColor greenColor]];
//图片
// [[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"bgImage.png"]];
}
swift:
if #available(iOS 15.0,*) {
let tabBarAppearanc = UITabBarAppearance.init()
//颜色
// tabBarAppearanc.backgroundColor = UIColor.green
//图片 tabBarAppearanc.backgroundImage = UIImage.init(named: "bgImage.png")
tabBarAppearanc.stackedLayoutAppearance.selected.titleTextAttributes = [NSAttributedString.Key.foregroundColor:UIColor.red]
// tabBarAppearanc.stackedLayoutAppearance.normal.titleTextAttributes = .....
self.tabBar.standardAppearance = tabBarAppearanc
self.tabBar.scrollEdgeAppearance = tabBarAppearanc
}else{
UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.foregroundColor: UIColor.black], for: .normal)
UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.foregroundColor: UIColor.red], for: .normal)
//颜色 UITabBar.appearance().barTintColor = UIColor.green
//图片// UITabBar.appearance().backgroundImage = UIImage.init(named: "bgImage.png")
}
2、iOS 15 UITableView sectionHeader下移22像素
iOS 15中 UITableView 新增了一个属性：sectionHeaderTopPadding。此属性会给每一个 section header 增加一个默认高度，当我们使用 UITableViewStylePlain 初始化UITableView 的时候，系统默认给 section header 增高了22像素。
解决办法：
object-c / swift:
if(@available(iOS 15.0,*)){tableView.sectionHeaderTopPadding=0;} //去掉headerpadding的高度
3、对状态编程的支持：UICellConfigurationState；UICollectionViewCell、UITableViewCell都支持状态变化时的block执行了。
4、UICollectionViewLayout支持自动高度；AutomaticDimension
5、json解析支持json5了
6、增加UISheetPresentationController，通过它可以控制 Modal 出来的 UIViewController 的显示大小，且可以通过拖拽手势在不同大小之间进行切换。
7、UIButton支持更多配置。UIButton.Configuration是一个新的结构体，它指定按钮及其内容的外观和行为。它有许多与按钮外观和内容相关的属性，如cornerStyle、baseForegroundColor、baseBackgroundColor、buttonSize、title、image、subtitle、titlePadding、imagePadding、contentInsets、imagePlacement等。
之前我们可能要自定义一个类来实现这种按钮，但是现在苹果新增了特性
object-c:
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.backgroundColor = [UIColor greenColor];
if (@available(iOS 15.0, *)) {
UIButtonConfiguration *conf = [UIButtonConfiguration tintedButtonConfiguration];
conf.cornerStyle = UIButtonConfigurationCornerStyleMedium;
[conf setImagePadding:5];
[conf setTitle:@"大标题"];
[conf setSubtitle:@"副标题"];
[conf setImage:[UIImage imageNamed:@"btnImage.png"]];
conf.imagePlacement = NSDirectionalRectEdgeLeading; button.configuration = conf;
} else {
// Fallback on earlier versions
}
swift:
let button:UIButton = UIButton.init(type: .custom)
button.backgroundColor = UIColor.green
if #available(iOS 15.0, *) {
var conf = UIButton.Configuration.tinted()
conf.cornerStyle = UIButton.Configuration.CornerStyle.medium
conf.imagePadding = 5
conf.title = "大标题"
conf.subtitle = "副标题"
conf.image = UIImage.init(named: "btnImage.png")
conf.imagePlacement = .leading
button.configuration = conf
}else{
// Fallback on earlier versions
}
8、推出CLLocationButton用于一次性定位授权，该内容内置于CoreLocationUI模块，但如果需要获取定位的详细信息仍然需要借助于CoreLocation。
9、URLSession 推出支持 async/await 的 API，包括获取数据、上传与下载
10、系统图片支持多个层，支持多种渲染模式。
11、UIImage 新增了几个调整尺寸的方法。
图片的尺寸变换
object-c:
UIImage *modeImg = [UIImage imageNamed:@"bgImage.png"];
NSLog(@"图片原尺寸%@",NSStringFromCGSize(modeImg.size));
if (@available(iOS 15.0, *)) {
modeImg = [modeImg imageByPreparingThumbnailOfSize:CGSizeMake(220, 100)];
NSLog(@"**111111**变换后图片原尺寸%@",NSStringFromCGSize(modeImg.size));
[modeImg prepareThumbnailOfSize:CGSizeMake(220, 100) completionHandler:^(UIImage * _Nullable) {
NSLog(@"###222###变换后图片原尺寸%@",NSStringFromCGSize(modeImg.size));
}];
} else {
// Fallback on earlier versions
};
//打印值
//2021-12-15 15:48:17.590981+0800 iOS15UI[71637:683127] 图片原尺寸{674, 206}
//2021-12-15 15:48:17.598647+0800 iOS15UI[71637:683127] **111111**变换后图片原尺寸{220, 100}
//2021-12-15 15:48:17.600537+0800 iOS15UI[71637:684293] ###222###变换后图片原尺寸{220, 100}
swift:
var modImg = UIImage.init(named: "btnImage.png")
print("原图片尺寸%@",modImg?.size as Any)
if #available(iOS 15.0, *) {
modImg = modImg?.preparingThumbnail(of: CGSize(width: 220, height: 100))
print("**111111**变换后图片原尺寸%@",modImg?.size as Any)
modImg?.prepareThumbnail(of: CGSize(width: 220, height: 100)){
img in print("###222###变换后图片原尺寸%@",modImg?.size as Any)
}
}
//打印值
//原图片尺寸%@ Optional((124.0, 120.0))
//**111111**变换后图片原尺寸%@ Optional((220.0, 100.0))
//###222###变换后图片原尺寸%@ Optional((220.0, 100.0))