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一般在ARC管理的方式之下,很难出现对象被过度释放的问题,下面是我将遇到的一个crash. * thread #: tid = , queue = , address=0x18) frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #: frame #…

Event Delivery: The Responder Chain When you design your app, it’s likely that you want to respond to events dynamically. For example, a touch can occur in many different objects onscreen, and you have to decide which object you want to respond to a…

问题现象:想在页面初始化的时候,使用self.presentViewController方法弹出个告警提示框UIAlertController.但行后报了个如下告警,同时告警框也出不来. 1 2015-03-10 09:55:34.197 Test[1140:29622] Warning: Attempt to present <UIAlertController: 0x7c95ca20> on <Test.ViewController: 0x7a6afc60> whose vie…

View Program iOS View and Window Architecture The view draw cycle When a view first appears on the screen, the system asks it to draw its content. The system captures a snapshot of this content and uses that snapshot as the view’s visual representati…

NSObject NSObject is the root class of most Objective-C class hierarchies. NSDataAsset The NSDataAsset class enables you to access an object from a data set type stored in an asset catalog. NSFileProviderExtension NSFileProviderExtension is the princ…

Navigating a Data Hierarchy with Table Views 导航数据表视图层次 A common use of table views—and one to which they’re ideally suited—is to navigate hierarchies of data. A table view at a top level of the hierarchy lists categories of data at the most general l…

快速上手iOS UIKit UIKit是苹果官方的framework, 其中包含了各种UI组件, window和view, 事件处理, 交互, 动画, 资源管理等基础设施支持. 按照前面的介绍, 用UIKit写UI可以用storyboard(Interface Builder)和代码两种方式. 大体的思路都是添加组件后, 设置属性, 设置尺寸位置约束, 处理响应事件. 这里主要介绍用代码写的情形. 希望这篇文章, 可以帮你快速上手UIKit, 熟悉常用的组件, 完成一些简单的UI界面相关任务.…

在使用JSONObject.fromObject的时候,出现“There is a cycle in the hierarchy”异常.   意思是出现了死循环,也就是Model之间有循环包含关系:   解决办法:   使用setCycleDetectionStrategy防止自包含   代码: JsonConfig jsonConfig=new JsonConfig();  jsonConfig.setIgnoreDefaultExcludes(false);    jsonConfig.se…

前言:博主接触iOS的编程也有一段时间,今天把有关UI控件的一些知识在这里做一些总结. 申明:此系列文章都是使用目前最新版本swift3.0.1进行讲解的,与其他版本可能略有差异. 一,UIKit之设置圆角及阴影(对于lable和button这两个简单控件就不介绍了) let imageView = UIImageView(frame: CGRect(x: , y: , width: , height: )) imageView.backgroundColor = UIColor.brown s…