cocoa

Choosing an integer type in core data

由 蓝咒 提交于 2021-01-02 20:40:40
问题 When I create models in core data, I'm always a little perplexed by which integer type I should choose—16, 32, 64. I'm almost always needing something for a simple, basic number: a count of people in the household, for my present case. Probably going to be a number between 1-20. Or, I have an incrementing case id number in another instance...can't imagine that going further than few hundred people. And here's the deal...It's clear that true computer science folk think of numbers differently,

Choosing an integer type in core data

由 荒凉一梦 提交于 2021-01-02 20:39:53
问题 When I create models in core data, I'm always a little perplexed by which integer type I should choose—16, 32, 64. I'm almost always needing something for a simple, basic number: a count of people in the household, for my present case. Probably going to be a number between 1-20. Or, I have an incrementing case id number in another instance...can't imagine that going further than few hundred people. And here's the deal...It's clear that true computer science folk think of numbers differently,

Choosing an integer type in core data

由 旧时模样 提交于 2021-01-02 20:39:49
问题 When I create models in core data, I'm always a little perplexed by which integer type I should choose—16, 32, 64. I'm almost always needing something for a simple, basic number: a count of people in the household, for my present case. Probably going to be a number between 1-20. Or, I have an incrementing case id number in another instance...can't imagine that going further than few hundred people. And here's the deal...It's clear that true computer science folk think of numbers differently,

Choosing an integer type in core data

由 匆匆过客 提交于 2021-01-02 20:39:10
问题 When I create models in core data, I'm always a little perplexed by which integer type I should choose—16, 32, 64. I'm almost always needing something for a simple, basic number: a count of people in the household, for my present case. Probably going to be a number between 1-20. Or, I have an incrementing case id number in another instance...can't imagine that going further than few hundred people. And here's the deal...It's clear that true computer science folk think of numbers differently,

How to use IKScannerDeviceView in Cocoa

由 孤街浪徒 提交于 2020-12-29 07:21:07
问题 How can I use IKScannerDeviceView to scan a document inside of my app? I tried adding an IKScannerDeviceView into my view through IB and setting its delegate to my app delegate (which implements the IKScannerDeviceViewDelegate), but when I run the app I get a view with the buttons Show Details and Scan , and only Show Details is enabled and when I click it nothing happens. I have a scanner plugged in and I can scan through Image Capture, but not through my app. Does anybody have a good

NSTableColumn size to fit contents

由 狂风中的少年 提交于 2020-12-29 03:46:47
问题 I am developing in and against Mac OS X 10.6 (Snow Leopard). When I double-click between two of my NSTableView's column headers, the column on the left autosizes, like you would expect. I want to provide this in a context menu as well, but it seems there is no publicly accessible function to do this. I've Googled, and looked at the documentation for NSTableView, NSTableHeaderView, and NSTableColumn, but found nothing. I find it hard to believe they wouldn't expose something so useful when

NSTableColumn size to fit contents

由 给你一囗甜甜゛ 提交于 2020-12-29 03:46:27
问题 I am developing in and against Mac OS X 10.6 (Snow Leopard). When I double-click between two of my NSTableView's column headers, the column on the left autosizes, like you would expect. I want to provide this in a context menu as well, but it seems there is no publicly accessible function to do this. I've Googled, and looked at the documentation for NSTableView, NSTableHeaderView, and NSTableColumn, but found nothing. I find it hard to believe they wouldn't expose something so useful when

Preprocessor macro value to Objective-C string literal

由 ￣綄美尐妖づ 提交于 2020-12-27 08:38:30
问题 I have a preprocessor macro defined in build settings FOO=BAR That value I want to massage into an Objective-C string literal that can be passed to a method. The following #define does not work, but it should demonstrate what I am trying to achieve: #define FOOLITERAL @"FOO" //want FOOLITERAL to have the value of @"BAR" myMethodThatTakesAnNSString(FOOLITERAL); I expect that I am just missing the obvious somehow, but I cannot seem to find the right preprocessor voodoo to get what I need. 回答1:

iOS求职之OC面试题

由 走远了吗. 提交于 2020-12-18 08:51:38
1、Objective-C的类可以多重继承么？可以采用多个协议么？ 答：不可以多重继承，可以采用多个协议。 2、#import和#include的区别是什么？＃import<> 跟 #import""有什么区别？ import能避免头文件被重复包含的问题: 1） 一般来说，导入objective c的头文件时用#import，包含c/c++头文件时用#include。 使用include要注意重复引用的问题： class A，class B都引用了class C，class D若引用class A与class B,就会报重复引用的错误。 2）#import 确定一个文件只能被导入一次，这使你在递归包含中不会出现问题。 所以，#import比起#include的好处就是它避免了重复引用的问题。所以在OC中我们基本用的都是import。 ＃import<> 包含iOS框架类库里的类，#import""包含项目里自定义的类。 3、Category是什么？扩展一个类的方式用继承好还是类目好？为什么？ 答 ：Category是类目。用类目好，因为继承要满足a is a b的关系，而类目只需要满足a has a b的关系，局限性更小，你不用定义子类就能扩展一个类的功能，还能将类的定义分开放在不同的源文件里, 用Category去重写类的方法，仅对本Category有效

Can't change column width in response to outlineViewItemDidExpand [closed]

由 依然范特西╮ 提交于 2020-12-15 03:57:41
问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 days ago . Improve this question I want to update the column width to the width of the widest entry whenever a node in my NSOutlineView is expanded. Thus, my delegate listens to outlineViewItemDidExpand and calls [column setWidth:maxColumnWidth]; in it. maxColumnWidth is the width of the widest entry. However,
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