Home > Developer > Mobile Develop

IOS Advanced Eighth Day (0407)

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
0407UIPickerView, Uidatepicker, and Uitoolbar see video and code PCH file 
#ifdef __OBJC__//在这里面写oc的引用,比如一些oc的头文件或者NSLog的别名定义。如果oc的头文件写在了外面,则会报很多错误,原因就是写在外面的话编译器以为是c语言的头文件,会按照c语言的方式去解析这个头文件,当然会报错.#endif非oc的类型写在外面,比如定义的c语言的类型
Uiapllication

As shown in the following:

Some other open protocols:

Program startup process, a program can display the interface is entirely due to the UIWindow

As shown in the following:

The following is an explanation of the official documentation:

Four object relationships

As shown in the following:

IOS Advanced Eighth Day (0407)

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More