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首页通过7个项目提升iOS应用开发：Swift 2 Blueprints实战指南

通过7个项目提升iOS应用开发：Swift 2 Blueprints实战指南

Swift

Blueprints

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"《Swift 2 Blueprints》是一本由Cecil Costa编著的Packt Publishing在2015年出版的专业书籍，专为iOS开发者设计，旨在通过实践项目提升读者的Swift编程技能。本书共包含七个精心策划的实战项目，让读者能够亲手构建出令人惊叹的应用程序，覆盖了iOS设备开发的广泛领域。首先，作者引导读者从基础开始，通过一个实用应用项目学习如何使用Swift语言进行开发。随后，书中深入讲解了娱乐和社交类应用的开发理念，例如创建一个允许设备间分享图片、音频和视频文件的小工具。接着，读者将学习如何构建一个拥有自定义表格视图的城市信息应用，这对于理解和优化iOS界面设计具有重要意义。对于智能手表应用，你将跟随教程制作一个提醒应用，这不仅锻炼了针对Apple Watch的特定开发技能，也展示了跨平台应用开发的策略。最后，本书还涵盖了使用SpriteKit开发游戏应用程序，帮助读者掌握游戏开发的基础知识和性能优化技巧。通过完成这些项目，读者不仅能掌握开发各种类型iOS应用的基本技能，还能了解如何应对不同设备的需求，以及如何通过复杂技术提升应用性能。此外，版权信息强调了所有内容的准确性，并提醒读者在未经许可的情况下不得复制或传播书中的信息，除非用于学术引用。《Swift 2 Blueprints》是一本全面且实用的资源，适合希望在Swift 2环境中提升iOS应用开发能力的开发者，无论是初学者还是有一定经验的开发者都能从中受益匪浅。通过实际操作，读者将能够积累宝贵的经验，为自己的职业发展打下坚实的基础。"

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Preface

[ ix ]

Piracy

Piracy of copyrighted material on the Internet is an ongoing problem across all

media. At Packt, we take the protection of our copyright and licenses very seriously.

If you come across any illegal copies of our works in any form on the Internet, please

provide us with the location address or website name immediately so that we can

pursue a remedy.

Please contact us at

pirated material.

We appreciate your help in protecting our authors and our ability to bring you

valuable content.

Questions

If you have a problem with any aspect of this book, you can contact us at

questions@packtpub.com, and we will do our best to address the problem.

[ 1 ]

Exploring Xcode

Programming is not only about code, it is also about methodology. It doesn't

matter how many years you've been programming with Xcode, there is always a

new feature that can speed up your development, mainly nowadays that there is a

new version every few months. Don't forget that Swift is a new language created

to replace the old Objective-C, which means that Xcode also needs to adopt new

features for this new programming language.

This book is about creating applications with the Swift programming language using

Xcode 6 as an IDE. The idea behind these apps is to show how to create different

kinds of real apps from scratch and this chapter presents with you some tricks on

how to use Xcode.

Even if you are already a developer with years of experience in Xcode, it is worth

reading this chapter because there is always a different way to do a task and it can be

very helpful. So, let's start reviewing some Xcode and Swift features. In this chapter,

we will cover:

• Keyboard shortcuts

• Versioning your project

• Testing with Playground

• Debugging

• New Swift features

• Some final comments

Exploring Xcode

[ 2 ]

Keyboard shortcuts

Have you ever thought of how much time a developer expends in moving the mouse

pointer? It can be a lot of time. How about reducing some time by memorizing a few

key combinations. Of course, don't expect to memorize all of them in a day. You can

practice them when it is necessary; you will see that, after a while, you will save a lot

of time. Of course, command + X, command + C, command + V, and command + Q are

not going to be mentioned for they are assumed to be known.

The rst shortcut we are going to learn is command + B, which is to build the solution

without running it on the device or simulator. This key combination is very useful

when you want to check whether the project has any errors, but you don't want to

waste time installing the app.

Sometimes, mainly when you have Swift and C on the same project, the compiler

caches the object les wrongly, so the best solution would be to clean everything

up and recompile again. To clean your entire project, use the command + shift + K

combination. Cleaning is a fast process, nevertheless, you have to remember that

afterward you need to rebuild your project, which might take a while.

If you want to build your product and run it, you have two options. The rst is

command + R that compiles your project if it is necessary and installs it on the device

or simulator; this combination is equivalent to pressing play on the left-hand side of

the toolbar. The second option is control + command + R, which installs the last build

but doesn't rebuild the project; it is very handy when your project takes a long time

to compile and you just want to reinstall it again for testing.

Now, let's learn some key combinations that will affect Xcode, visually speaking.

On the left-hand side, we have the Navigator. As you know, here is where you can

access the project les, the search results, and the compilation status. The following

screenshot shows a sample of the Navigator:

Chapter 1

[ 3 ]

If you need more visual space, you can hide the Navigator area with command + 0, or

you can show this area using the same combination. It is very useful when you have

a small screen like a MacBook screen and you need to work with the interface builder

or Playground.

As you can see, there is a bar on the top (called the Navigator bar), which allows

you to access different sections of the Navigator. You can click on each icon or

you can save some time by pressing command + a number from 1 to 8, 1 being the

project navigator (folder icon), 2 the symbol navigator, and so on till 8, which is the

report navigator.

Every Navigator section has a text eld at the bottom to lter the content that is

being displayed on the Navigator. You can reach this text eld very fast by using

the command + option + J combination. So, based on the previous combination, when

you need to access a le, you can go to the project navigator by pressing command + 1

followed by command + option + J.

To nish with the Navigator area, you should know that you have a shortcut to go to

the project navigator and highlight the current le, it is command + shift + J.

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解释这段代码 if args.safe: blueprints = [x for x in blueprints if int(x.get_attribute('number_of_wheels')) == 4] blueprints = [x for x in blueprints if not x.id.endswith('isetta')] blueprints = [x for x in blueprints if not x.id.endswith('carlacola')] blueprints = [x for x in blueprints if not x.id.endswith('cybertruck')] blueprints = [x for x in blueprints if not x.id.endswith('t2')]

2. 通过`endswith()`方法，筛选掉车辆蓝图ID以'isetta'、'carlacola'、'cybertruck'、't2'结尾的蓝图对象，因为这些车辆蓝图可能不符合安全标准。最终，`blueprints`列表中只留下符合安全标准的车辆蓝图。

解释这段代码blueprints = sorted(blueprints, key=lambda bp: bp.id)

在这里，`blueprints`列表即为可迭代对象，`key`参数为排序的关键字，`lambda bp: bp.id`表示按照每个蓝图对象的ID属性进行排序，即按照字母顺序对蓝图进行排序。最终，`blueprints`列表按照蓝图ID属性进行了排序...

解释这段代码代码 if args.safe: blueprints = [x for x in blueprints if int(x.get_attribute('number_of_wheels')) == 4] blueprints = [x for x in blueprints if not x.id.endswith('isetta')] blueprints = [x for x in blueprints if not x.id.endswith('carlacola')] blueprints = [x for x in blueprints if not x.id.endswith('cybertruck')] blueprints = [x for x in blueprints if not x.id.endswith('t2')] blueprints = sorted(blueprints, key=lambda bp: bp.id) spawn_points = world.get_map().get_spawn_points() number_of_spawn_points = len(spawn_points)

这段代码主要是根据命令行参数(args)中的设置来过滤车辆蓝图，只选择安全的车辆蓝图。首先，`if args.safe:` 判断是否只选择安全的车辆蓝图。如果是，代码将对所有车辆蓝图进行过滤，只选择车轮数为4的车辆，而且...

[AssetLog] D:\HX0201\Content\Blueprints\BP\Socket.uasset

[AssetLog] D:\HX0201\Content\Blueprints\BP\Socket.uasset 是一个文件路径，指向一个名为 Socket 的蓝图类的资源文件。蓝图是一种在虚幻引擎中用于创建游戏逻辑和交互的可视化编程工具。Socket 蓝图可能包含了一些...

请帮我将这段代码改为设置8个固定的NPC代码，并加入设置每个NPC的速度和加速度以及行驶路线的代码# Spawn vehicles # -------------- batch = [] for n, transform in enumerate(spawn_points): print('n',n) print('transform',transform) if n >= args.number_of_vehicles: break blueprint = random.choice(blueprints) print('blueprints的长度', len(blueprints)) print('blueprints',blueprints) print('blueprint', blueprint) if blueprint.has_attribute('color'): color = random.choice(blueprint.get_attribute('color').recommended_values) blueprint.set_attribute('color', color) if blueprint.has_attribute('driver_id'): driver_id = random.choice(blueprint.get_attribute('driver_id').recommended_values) blueprint.set_attribute('driver_id', driver_id) blueprint.set_attribute('role_name', 'autopilot') # prepare the light state of the cars to spawn light_state = vls.NONE if args.car_lights_on: light_state = vls.Position | vls.LowBeam | vls.LowBeam # spawn the cars and set their autopilot and light state all together batch.append(SpawnActor(blueprint, transform) .then(SetAutopilot(FutureActor, True, traffic_manager.get_port())) .then(SetVehicleLightState(FutureActor, light_state))) for response in client.apply_batch_sync(batch, synchronous_master): if response.error: logging.error(response.error) else: vehicles_list.append(response.actor_id)

npc_blueprints = ["vehicle.nissan.micra", "vehicle.audi.a2", "vehicle.tesla.model3", "vehicle.bmw.grandtourer", "vehicle.toyota.prius", "vehicle.nissan.patrol", "vehicle.audi.etron", "vehicle....

tkinter gui application development blueprints second

《tkinter GUI应用程序开发蓝图第二版》是一本关于tkinter库在Python中进行GUI应用程序开发的书籍。在这本书中，作者从基本的概念入手，引导读者逐步掌握tkinter库的使用。这本书提供了详细的教程和示例，介绍了...

sfml blueprints

SFML蓝图是一本关于SFML库的书籍。SFML是一个简单易用的多媒体库，用于开发跨平台的图形、音频和输入应用程序。而SFML蓝图是为了帮助开发者使用SFML库来构建不同类型的应用程序而编写的。这本书提供了一系列的项目...

解释这段代码blueprints = world.get_blueprint_library().filter(args.filterv) blueprintsWalkers = world.get_blueprint_library().filter(args.filterw)

这段代码是在使用CARLA自动驾驶仿真环境时，用来获取可用蓝图的函数。其中`world`变量是CARLA仿真环境的世界对象，`get_blueprint_library...最终，`blueprints`和`blueprintsWalkers`分别是可用的车辆和行人蓝图列表。

关于Arduino的文献综述

4. Internet of Things with Arduino Blueprints (2015) 这本书介绍了如何使用Arduino创建物联网（IoT）应用程序，如传感器网络、监视系统、智能家居等。它提供了各种实例，从基础到高级的应用程序，以帮助读者更好...

请帮我将这段代码改为设置4个固定的NPC代码# Spawn vehicles # -------------- batch = [] for n, transform in enumerate(spawn_points): print('n',n) print('transform',transform) if n >= args.number_of_vehicles: break blueprint = random.choice(blueprints) print('blueprints的长度', len(blueprints)) print('blueprints',blueprints) print('blueprint', blueprint) if blueprint.has_attribute('color'): color = random.choice(blueprint.get_attribute('color').recommended_values) blueprint.set_attribute('color', color) if blueprint.has_attribute('driver_id'): driver_id = random.choice(blueprint.get_attribute('driver_id').recommended_values) blueprint.set_attribute('driver_id', driver_id) blueprint.set_attribute('role_name', 'autopilot') # prepare the light state of the cars to spawn light_state = vls.NONE if args.car_lights_on: light_state = vls.Position | vls.LowBeam | vls.LowBeam # spawn the cars and set their autopilot and light state all together batch.append(SpawnActor(blueprint, transform) .then(SetAutopilot(FutureActor, True, traffic_manager.get_port())) .then(SetVehicleLightState(FutureActor, light_state))) for response in client.apply_batch_sync(batch, synchronous_master): if response.error: logging.error(response.error) else: vehicles_list.append(response.actor_id)

blueprint = random.choice(blueprints) if blueprint.has_attribute('color'): color = random.choice(blueprint.get_attribute('color').recommended_values) blueprint.set_attribute('color', color) if ...

解释这段代码 if args.sync: settings = world.get_settings() traffic_manager.set_synchronous_mode(True) if not settings.synchronous_mode: synchronous_master = True settings.synchronous_mode = True settings.fixed_delta_seconds = 0.05 world.apply_settings(settings) else: synchronous_master = False blueprints = world.get_blueprint_library().filter(args.filterv) blueprintsWalkers = world.get_blueprint_library().filter(args.filterw)

接下来的代码，`blueprints = world.get_blueprint_library().filter(args.filterv)`和`blueprintsWalkers = world.get_blueprint_library().filter(args.filterw)`，获取了所有符合车辆蓝图过滤器(args.filterv)和...

这段代码 def generate_npc(): blueprint = world.get_blueprint_library().find(npc_blueprints[i]) color = random.choice(blueprint.get_attribute('color').recommended_values) blueprint.set_attribute('color', color) # if blueprint.has_attribute('driver_id'): # driver_id = random.choice(blueprint.get_attribute('driver_id').recommended_values) # blueprint.set_attribute('driver_id', driver_id) blueprint.set_attribute('role_name', 'autopilot') start_point =carla.Location(x=npc_startpoints[i][0], y=npc_startpoints[i][1], z=npc_startpoints[i][2]) end_point = carla.Location(x=npc_endpoints[i][0], y=npc_endpoints[i][1], z=npc_endpoints[i][2]) transform = carla.Transform(start_point, carla.Rotation(yaw=0)) #0和180分别代表绕Z轴的偏航角度。在 carla.Rotation() 中，参数 yaw 表示偏航角度，即车辆或物体相对于地图坐标系（东北天）的旋转角度，以度为单位。0度表示车辆或物体朝向东方，180度表示车辆或物体朝向西方。 target_location = carla.Transform(end_point, carla.Rotation(yaw=180)) # 创建目标Transform对象 # print('aaaaa') #--- NPC =world.spawn_actor(blueprint, transform) #已生成车辆 NPC.set_autopilot(True) NPC.apply_control(carla.VehicleControl(throttle=1.0, steer=0.0, brake=0.0, hand_brake=False, reverse=False, manual_gear_shift=False, gear=0)) # 设置Vehicle的位置和朝向 NPC.set_transform(target_location) return NPC global NPC NPC = generate_npc() global blueprint global transform def reset_npc(): NPC.destroy() NPC=generate_npc()报错 ^ SyntaxError: name 'NPC' is assigned to before global declaration

blueprint = world.get_blueprint_library().find(npc_blueprints[i]) color = random.choice(blueprint.get_attribute('color').recommended_values) blueprint.set_attribute('color', color) # if blueprint....

Traceback (most recent call last): File "C:\Users\X\Desktop\2023夏\Supplement-shop-main\backend\blueprints\address_bp.py", line 3, in <module> from config import db ImportError: cannot import name 'db' from 'config' (D:\pycharm\anaconda3.6\lib\site-packages\config\init.py)

2. "db"可能被定义在了其他地方，而不是在"config"模块中。请检查你的代码，确认"db"确实在"config"模块中定义。 3. 可能存在名称冲突。请确保你没有使用与标准库或其他第三方库冲突的名称。 4. 可能是因为路径问题...

ue4用什么语言编写代码

2. 蓝图（Blueprints）：蓝图是一种基于图形化编程的方式，可以让非程序员也能够创建游戏逻辑和交互。使用蓝图，开发者可以在UE4编辑器中将各种功能块（节点）拖拽连接起来，形成游戏的逻辑流程。蓝图提供了大量的...

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通过7个项目提升iOS应用开发：Swift 2 Blueprints实战指南

Swift 2 Blueprints 无水印pdf 0分

Raspberry Pi LED Blueprints(PACKT,2015)

blueprints-neo4j2-graph 下载

解释这段代码blueprints = sorted(blueprints, key=lambda bp: bp.id)

[AssetLog] D:\HX0201\Content\Blueprints\BP\Socket.uasset

tkinter gui application development blueprints second

sfml blueprints

解释这段代码blueprints = world.get_blueprint_library().filter(args.filterv) blueprintsWalkers = world.get_blueprint_library().filter(args.filterw)

关于Arduino的文献综述

flask网页面切换

UE4打开外部exe程序

请帮我列出五本QT程序设计需要参考的文献，注明作者要求近五年以内的

Traceback (most recent call last): File "C:\Users\X\Desktop\2023夏\Supplement-shop-main\backend\blueprints\address_bp.py", line 3, in <module> from config import db ImportError: cannot import name 'db' from 'config' (D:\pycharm\anaconda3.6\lib\site-packages\config\__init__.py)

ue4用什么语言编写代码

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Traceback (most recent call last): File "C:\Users\X\Desktop\2023夏\Supplement-shop-main\backend\blueprints\address_bp.py", line 3, in <module> from config import db ImportError: cannot import name 'db' from 'config' (D:\pycharm\anaconda3.6\lib\site-packages\config\init.py)