ipad | 易学教程

iOS8 Size-Classes and Popover Views

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问题 I had an issue with Popover on an iPad app I was working on recently...going to just post it here as I think it may help others. I'm using Xcode 6 and iOS 8 and Size Classes and the Popover View was built in a Storyboard. As my iPad App is in Regular/Regular Size Class all the time I built the Popover view in R/R too. No matter what I did with Constraints though, the popover just never looked right, it was a mess. So what was wrong?? 回答1: After some time the penny dropped to check the Any/Any

iOS8 Size-Classes and Popover Views

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Get Image of PKDrawing in Light mode

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问题 I want my UI to support dark mode, but not my PKCanvasView. I used myCanvasView.overrideUserInterfaceStyle = .light so the dark mode does not apply to it and it worked: Black lines stay black and white lines stay white, while the rest of the UI is responsive to the system setting. However, when I try to capture an image of the PKDrawing like this: myCanvasView.drawing.image(from: myCanvasView.bounds, scale: CGFloat(1.0)) the white lines on the image change to black and black lines change to

Universal iOS app crashing on iPhone/iTouch 3.1.3 due to UIPopoverController

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问题 I just updated my app so that it's a universal app. In doing so I added support for UIPopoverController in a certain place. Now the app seems to be crashing on 3.1.3 iPhone/iTouch devices: OS Version: iPhone OS 3.1.3 (7E18) Report Version: 104 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x00000001, 0xe7ffdefe Crashed Thread: 0 Dyld Error Message: Symbol not found: _OBJC_CLASS_$_UIPopoverController What I don't get is that I'm only trying to call UIPopoverController if the

基于Windows的iPad/iPhone开发编译环境

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基于Windows的iPad/iPhone开发编译环境公司要做ios方面开发，打算现在xp上研究一下，目前在 windows 操作系统开发 iOS 应用程序有 5 种可选的方案。方法一：黑苹果黑苹果 -- 就是指不是苹果电脑（普通 PC ），装了苹果的 MacOS 。这就是黑苹果。 PC 配置要求： CPU:Intel LGA775 系列 CPU 安装成功的机会较大主板芯片组： Intel 9 系列 3 系列和 4 系列的成功几率比较大安装教程： http://macos.it168.com/thread-33124-1-1.html 关于黑苹果： http://baike.baidu.com/view/2173094.htm?fr=ala0_1 优点：系统运行速度快，模拟最真实缺点：安装过程复杂，成功率低，对硬件要求比较高。方法二：利用 vmware 搭建 iphone 开发环境硬件环境 Intel Core2 E8400@3.00GHz 内存 :2G 软件环境： winxp sp3 ， vmware workstation 7.0 参考地址： http://mabei.javaeye.com/blog/607011 http://yafei.javaeye.com/blog/787794 优点：安装相对简单，对系统配置要求较低缺点：运行速度比较慢

iOS Development: What are some reasons that [[self navigationController] viewControllers]; would return nil?

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问题 the following statement is returning an nil... NSArray *viewControllersInNavStack = [[self navigationController] viewControllers]; and this statement is being called in a view controller that's about four levels deep in the navigation stack, so I don't understand how or why it would ever return nil. Your thoughts? Thanks so much for your wisdom! 回答1: Doesn't sound like its your issue, but docs say "Only returns a navigation controller if the view controller is in its stack. This property is

SQLITE3 inserting a null value

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问题 sqlite3_bind_int(statement, 1, nil); How can I add a null in my above statement , as I am making this field auto increment. Here's my code : if (sqlite3_open([[self dataFilePath] UTF8String], &database)!= SQLITE_OK) { sqlite3_close(database); NSAssert(0, @"Failed to open database"); } NSLog(@"json count ========== %i",[jsonArray count]); for (int i =0 ; i < [jsonArray count]; i++) // while (i < [jsonArray count]) { dictionary = [jsonArray objectAtIndex:i]; char *errorMsg; sqlite3_stmt

SKSpriteKit, detect non-transparency parts

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问题 I am making a game in SKSpriteKit, I am trying to make a foreground object with this Image, http://minus.com/i/OQ0boloElnCr if an object touches the non-transparency in the picture(the ceiling and rock paths), the object dies. Is it possible in Sprite kit to detect the ceiling, the non-transparency parts of the image 来源： https://stackoverflow.com/questions/20089846/skspritekit-detect-non-transparency-parts

8 Capabilities Unavailable for specific app

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问题 Hi I have an app which is also live, For the next version I want to implement deep linking for this I have to enable Associated Domains. I have enabled it at bundle Identifier also created new provisioning profile downloaded and double clicked it. But still 8 capabilities missing, Associated Domains is one of them. Please someone help how can I get Associated Domains under capabilities. Only attached options are there. Thanks in advance. 回答1: For me it was because my developer membership

Deleting in NSDocumentDirectory and UIScrollView

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问题 Having a problem with my code, was able to have a preview with thumbnail with images in a UIScrollView . My images is from NSDocumentDirectory . I can delete from it though but I can delete from it (in terms of VIEW & in NSDocumentDirectory ) PROPERLY when I start from the right to left position. PROBLEM: Now, I can delete anyway, But I have some several problems. First , though I can delete, the view is not arranging, my rearrangeItems: method is not being called also. Second ,Then at first