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5分钟了解 App Inventor 2：不会写代码，也能做出自己的 App - App应用开发...
...术课、创客教育、编程社团的最佳教学工具
4. 产品经理/创业者：快速验证App想法，不用等开发排期
5. IoT/硬件玩家：通过蓝牙、MQTT连接硬件，用手机控制你的设备
5分钟快速体验
想试试？三步就够了：
第一步：打开浏...
Using multiple let-as within a if-statement in Swift
...iple queries in your optional chaining operation:
let dict = ["latitude": 2.0 as AnyObject?, "longitude": 10.0 as AnyObject?]
let latitude = dict["latitude"]
let longitude = dict["longitude"]
if let latitude = latitude as? Double, let longitude = longitude as? Double {
print(latitude, longitud...
What are the correct version numbers for C#?
...IEnumerators which implemented IDisposable. A few other small features.
C# 2.0 released with .NET 2.0 and VS2005 (November 2005). Major new features: generics, anonymous methods, nullable types, iterator blocks
C# 3.0 released with .NET 3.5 and VS2008 (November 2007). Major new features: lambda expr...
Adding rounded corner and drop shadow to UICollectionViewCell
...ew's layer to achieve both results.
cell.contentView.layer.cornerRadius = 2.0f;
cell.contentView.layer.borderWidth = 1.0f;
cell.contentView.layer.borderColor = [UIColor clearColor].CGColor;
cell.contentView.layer.masksToBounds = YES;
cell.layer.shadowColor = [UIColor blackColor].CGColor;
cell.laye...
奇葩职位为何频现互联网？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...此前大中小企业资本运作都很活跃。可以说，在线旅游给创业者的机会越来越少了。
◎在投入和盈利上，途牛网是花2块赚1块；去哪儿是花1.1块赚1块；同程虽然没有上市，但可以负责任地说，是花1块赚1块。
◎我认为价格战一...
Detect Retina Display
... running iOS4+ and if the [UIScreen mainScreen].scale property is equal to 2.0. You CANNOT assume a device is running iOS4+ if the scale property exists, as the iPad 3.2 also contains this property.
On an iPad running iOS3.2, scale will return 1.0 in 1x mode, and 2.0 in 2x mode -- even though we k...
How do I detect what .NET Framework versions and service packs are installed?
... HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322\Install
2.0 HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\Install
3.0 HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.0\Setup\InstallSuccess
3.5 HKLM\Software\Microsoft\N...
互联网造车运动 - 资讯 - 清泛网 - 专注C/C++及内核技术
...分两路，一批在北美，一批是国内团队。
近日，电动车创业公司FaradayFuture正在寻址建造投资10亿美元的电动车工厂，这引发业内的关注。Faraday具有超豪华团队阵容，大部分来自特斯拉。Faraday网站网站列出的五人高管团队中，...
Cast List to List in .NET 2.0
...
.NET 2.0 has the ConvertAll method where you can pass in a converter function:
List<int> l1 = new List<int>(new int[] { 1, 2, 3 } );
List<string> l2 = l1.ConvertAll<string>(delegate(int i) { return i.To...
.NET 4.0 has a new GAC, why?
...s the new GAC . Does it mean now we have to manage two GACs, one for .NET 2.0-3.5 applications and the other for .NET 4.0 applications?
...