Swift 4实战：数百个精选代码片段

需积分: 9 83 浏览量更新于2024-07-17 收藏 2.11MB PDF 举报

"Swift 4 Recipes - 几百个实用的手选代码片段，由Yanis Zafirópulos撰写，旨在提供无废话、直接解决问题的方案。本书旨在帮助iOS开发者通过Swift 4实现各种功能，提升开发效率。" 在Swift 4 Recipes这本书中，作者Yanis Zafirópulos精心挑选了数百个实用的Swift 4代码片段，这些片段涵盖了iOS开发中的常见问题和解决方案。Swift是一种由Apple开发的编程语言，特别适合用于构建iOS、macOS、watchOS和tvOS的应用程序。Swift 4是该语言的一个版本，它带来了许多改进，包括更稳定的API、更强的类型推断以及更好的错误处理机制。 1. **类型安全**：Swift 4 强调类型安全，这使得开发者在编写代码时能够尽早发现潜在的错误，避免在运行时出现意外的类型转换问题。 2. **API设计指南**：Swift 4遵循Swift API设计指南，使公开的API更加清晰和易用，鼓励使用更具表达力的命名。 3. ** Codable 协议**：Swift 4 引入了 `Codable` 协议，简化了JSON或XML数据的序列化和反序列化过程，使得数据交换更方便。 4. **泛型**：书中的代码片段可能涵盖如何有效利用泛型编写可复用的代码，提高代码的灵活性和效率。 5. **枚举增强**：Swift 4 中的枚举支持关联值和原始值，可以用来表示复杂的数据结构，而且可以采用CaseIterable协议自动创建所有枚举案例的数组。 6. **错误处理**：书中可能详细介绍了如何在Swift 4中使用`try`, `catch`, 和`do`关键字进行错误处理，确保程序在遇到问题时能够优雅地失败。 7. **函数式编程**：Swift 支持函数式编程概念，如高阶函数、map、filter和reduce等，书中的代码片段可能会展示如何使用这些功能来解决实际问题。 8. **GCD（Grand Central Dispatch）**：Swift 4 与苹果的GCD紧密集成，书里可能会包含如何使用GCD来管理并发和多线程的示例。 9. **UI编程**：Swift 4 Recipes可能包含了关于如何使用Swift进行用户界面编程的实例，如AutoLayout、Storyboard和SwiftUI的使用。 10. **Core Data**：对于数据持久化的解决方案，书里可能会介绍如何使用Swift 4与Core Data进行交互，创建模型、管理关系、进行查询等。通过学习这本书，读者将能够深入理解Swift 4的各种特性和最佳实践，提高编写高效、可靠和易于维护的iOS应用程序的能力。每个代码片段都旨在解决一个具体问题，并解释其工作原理，帮助开发者快速找到并应用到自己的项目中。无论你是Swift新手还是经验丰富的开发者，这本书都能提供宝贵的参考资料。

xvi

7-6. Check if string contains string .....................................................................87

Problem .........................................................................................................87

Solution .........................................................................................................88

How It Works .................................................................................................88

7-7. Check if string ends with RegEx ..................................................................88

Problem .........................................................................................................88

Solution .........................................................................................................89

How It Works .................................................................................................89

7-8. Check if string ends with string...................................................................89

Problem .........................................................................................................89

Solution .........................................................................................................90

How It Works .................................................................................................90

7-9. Check if string is empty ...............................................................................90

Problem .........................................................................................................90

Solution .........................................................................................................90

How It Works .................................................................................................91

7-10. Check if string starts with RegEx ..............................................................91

Problem .........................................................................................................91

Solution .........................................................................................................91

How It Works .................................................................................................92

7-11. Check if string starts with string ...............................................................92

Problem .........................................................................................................92

Solution .........................................................................................................92

How It Works .................................................................................................93

7-12. Check if two strings are equal ................................................................... 93

Problem .........................................................................................................93

Solution .........................................................................................................93

How It Works .................................................................................................93

Table of ConTenTs

xvii

7-13. Compare two strings .................................................................................94

Problem .........................................................................................................94

Solution .........................................................................................................94

How It Works .................................................................................................94

7-14. Concatenate strings...................................................................................94

Problem .........................................................................................................94

Solution .........................................................................................................95

How It Works .................................................................................................95

7-15. Convert string to capitalized ......................................................................95

Problem .........................................................................................................95

Solution .........................................................................................................95

How It Works .................................................................................................96

7-16. Convert string to data ................................................................................ 96

Problem .........................................................................................................96

Solution .........................................................................................................96

How It Works .................................................................................................97

7-17. Convert string to double ............................................................................97

Problem .........................................................................................................97

Solution .........................................................................................................97

How It Works .................................................................................................98

7-18. Convert string to ﬂoat ................................................................................ 98

Problem .........................................................................................................98

Solution .........................................................................................................98

How It Works .................................................................................................98

7-19. Convert string to integer ............................................................................99

Problem .........................................................................................................99

Solution .........................................................................................................99

How It Works .................................................................................................99

Table of ConTenTs

xviii

7-20. Convert string to lowercase .......................................................................99

Problem .........................................................................................................99

Solution .......................................................................................................100

How It Works ...............................................................................................100

7-21. Convert string to uppercase ....................................................................100

Problem .......................................................................................................100

Solution .......................................................................................................100

How It Works ...............................................................................................101

7-22. Create an empty string ............................................................................101

Problem .......................................................................................................101

Solution .......................................................................................................101

How It Works ...............................................................................................101

7-23. Create NSString from string ....................................................................102

Problem .......................................................................................................102

Solution .......................................................................................................102

How It Works ...............................................................................................102

7-24. Find phone number in string ...................................................................103

Problem .......................................................................................................103

Solution .......................................................................................................103

How It Works ...............................................................................................104

7-25. Find URL in string ....................................................................................104

Problem .......................................................................................................104

Solution .......................................................................................................104

How It Works ...............................................................................................105

7-26. Format number in string with leading zeros ...........................................105

Problem .......................................................................................................105

Solution .......................................................................................................105

How It Works ...............................................................................................106

Table of ConTenTs

xix

7-27. Format number in string with speciﬁc decimal places ...........................106

Problem .......................................................................................................106

Solution .......................................................................................................107

How It Works ...............................................................................................107

7-28. Format string by padding left with spaces .............................................. 107

Problem .......................................................................................................107

Solution .......................................................................................................108

How It Works ...............................................................................................108

7-29. Format string by padding right with spaces ............................................108

Problem .......................................................................................................108

Solution .......................................................................................................109

How It Works ...............................................................................................109

7-30. Generate a unique identiﬁer string .......................................................... 109

Problem .......................................................................................................109

Solution .......................................................................................................110

How It Works ...............................................................................................110

7-31. Get character at index in string ...............................................................110

Problem .......................................................................................................110

Solution .......................................................................................................110

How It Works ...............................................................................................111

7-32. Get ﬁrst X characters from string ............................................................111

Problem .......................................................................................................111

Solution .......................................................................................................111

How It Works ...............................................................................................112

7-33. Get index of character in string ...............................................................112

Problem .......................................................................................................112

Solution .......................................................................................................112

How It Works ...............................................................................................113

Table of ConTenTs

7-34. Get index of substring in string ...............................................................113

Problem .......................................................................................................113

Solution .......................................................................................................113

How It Works ...............................................................................................114

7-35. Get last X characters from string .............................................................114

Problem .......................................................................................................114

Solution .......................................................................................................115

How It Works ...............................................................................................115

7-36. Get length of string .................................................................................. 115

Problem .......................................................................................................115

Solution .......................................................................................................116

How It Works ...............................................................................................116

7-37. Get length of Unicode string ....................................................................116

Problem .......................................................................................................116

Solution .......................................................................................................116

How It Works ...............................................................................................117

7-38. Get substring from string in range ..........................................................117

Problem .......................................................................................................117

Solution .......................................................................................................117

How It Works ...............................................................................................118

7-39. Loop through characters in string ...........................................................118

Problem .......................................................................................................118

Solution .......................................................................................................118

How It Works ...............................................................................................118

7-40. Repeat a string several times ..................................................................119

Problem .......................................................................................................119

Solution .......................................................................................................119

How It Works ...............................................................................................119

Table of ConTenTs

剩余422页未读，继续阅读

localsg

粉丝: 5
资源: 77

Swift 4实战：数百个精选代码片段

Swift 4 Recipes

PyPI 官网下载 | pangeo_forge_recipes-0.0.0-py3-none-any.whl

Python库 | pangeo_forge_recipes-0.4.0-py3-none-any.whl

copy_kernel() { echo "Using custom kernel '$1' ..." CUSTOM_KERNEL="$(basename $1)" cp -v "$1" "$SCRIPT_DIR/../recipes/.packages/$CUSTOM_KERNEL" CUSTOM_HEADER="linux-headers-${CUSTOM_KERNEL#linux-image-}" cp -v "$(dirname $1)/$CUSTOM_HEADER" "$SCRIPT_DIR/../recipes/.packages/$CUSTOM_HEADER" }

petalinux配置rs485

rk3568的yocto编译是如何生成yocto/build/tmp/work/x86_64-linux/rust-cross-armv8a-glibc/1.59.0-r0/targets/aarch64-poky-linux.json文件的，请详细解决一下生成过程

ERROR: Task (/opt/pkg/petalinux/2019.1/components/yocto/source/arm/layers/meta-xilinx/meta-xilinx-bsp/recipes-bsp/u-boot/u-boot-xlnx_2019.1.bb:do_compile) failed with exit code '1'

最新资源