存储了数据之后,可以通过value(forKey:)方法读取对应的数据。这里需要注意,返回的数据类型需要进行强制转换。 // 读取字符串类型的数据ifletusername=userDefaults.string(forKey:"user_name"){print("用户名:\(username)")// 输出用户名}// 读取整数类型的数据letuserAge=userDefaults.integer(forKey:"user_age")...
...二、Swift中的字典(Dictionary) Swift中字典和Objective-C中的字典除了语法不一样外,用法也是大同小异的。字典中存放的就是Key和Value也就是键值对。...(4) 增加元素 往已有的可变字典中增加元素就简单多了,直接通过key就可以给value赋值。在可变字典中,如果key已经存在,那么就变成上面的修改字典的值了。.....
Swift Dictionary subscript(_:default:) Instance Subscript subscript(_:default:) Accesses the value with the given key, falling back to the given default value if the key isn’t found. iOS 8.0+iPadOS 8.0+Mac Catalyst 13.0+macOS 10.10+tvOS 9.0+visionOS 1.0+watchOS 2.0+ ...
TableColumn("Name", value: \.name) } } } I get the following error: Key path value type 'String?' cannot be converted to contextual type 'String' I can solve using \.name!, but I'd like to give a default value instead (something like \.name ?? "default"). How can I achieve ...
17.1.1•Public• Publisheda day ago This package does not have a README.Add a READMEto your package so that users know how to get started. Readme Keywords none Install npm i@codingame/monaco-vscode-swift-default-extension Repository ...
The database returned no natively generated identity value 和Field 'id' doesn't have a default value,程序员大本营,技术文章内容聚合第一站。
(Lcom/alibaba/fastjson/parser/DefaultJSONParser;--Accessing value from uninitialized register 52解决方法,程序员大本营,技术文章内容聚合第一站。
InboundEnvironmentEndpointCollectionOutput InboundEnvironmentEndpointOutput Ingress IngressOutput IpSecurityRestriction IpSecurityRestrictionOutput JwtClaimChecks JwtClaimChecksOutput KeyInfo KeyInfoOutput KeyValuePairStringObject KeyValuePairStringObjectOutput KubeEnvironment KubeEnvironmentCollectionOutput KubeE...
// 1: Declare object (just conform to Codable, getting default encoder / decoder implementation for free) struct VolumeSetting: Codable { let sourceName: String let value: Double } let setting = VolumeSetting(sourceName: "Super Expensive Headphone Amp", value: 0.4) let key: String = String...
2022-11-08 18:27:45.564063+0100 test[19072:332743] [SceneConfiguration] Info.plist configuration "Default Configuration" for UIWindowSceneSessionRoleApplication contained UISceneClassName key, but could not load class with name "". Could not cast value of type 'NSNull' (0x1b7cc9a28) to 'NS...