swift几乎可以用任何字符作为常量和变量的名字例如:let π = 3.14159let 网址 = "http://www.cnblogs.com/walter371"let {emoji表情} = "王大力和王二力"//emoji表情是一种特殊的Unicode字符//在mac上可以使用快捷键:c...
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编程语言 时间:
2014-09-12 03:35:32
阅读次数:
206
像这样定义一个结构体
struct Vector2D {
var x = 0.0
var y = 0.0
}
当 Vector2D 的两个变量相加时,我们需要这样做:
let v1 = Vector2D(x: 2.0, y: 3.0)
let v2 = Vector2D(x: 4.0, y: 5.0)
var v3 = Vector2D(x: v1.x + v2.x...
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编程语言 时间:
2014-09-11 19:26:42
阅读次数:
154
(1)
let types: UIUserNotificationType = UIUserNotificationType.Alert | UIUserNotificationType.Badge
let mySettings: UIUserNotificationSettings = UIUserNotificationSettings(forTypes: types, ca...
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移动开发 时间:
2014-09-11 15:27:42
阅读次数:
249
Hello,Wearewritingtoletyouknowwehaveremovedyoursellingprivileges,canceledyourlistings,andplacedatemporaryholdonanyfundsinyourselleraccount.Anynewselli...
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其他好文 时间:
2014-09-10 20:55:50
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233
# The IoC Container 控制反转容器 ## Basic Binding 基础绑定 Now that we‘ve learned about dependency injection, let‘s explore inversion of control containers. IoC containers make managing your class ...
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移动开发 时间:
2014-09-09 09:13:08
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383
NASM has a simplified syntax designed to let the user code with minimum overhead. In its simplest form, a NASM program needs nothing more than the ass...
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其他好文 时间:
2014-09-06 22:31:13
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379
Nowadays it is becoming increasingly difficult to park a car in cities successfully. Let's imagine a segment of a street as long as L meters along which
a parking lot is located. Drivers should park...
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其他好文 时间:
2014-09-06 02:16:42
阅读次数:
286
Swift数字类型之间的转换Swift是一种安全的语言,对于类型的检查非常严格,不同类型之间不能随便转换。一、整型之间的转换在C和Objective-C等其他语言中,整型之间有两种转换方法:从小范围数到大范围数转换是自动的;从大范围数到小范围数需要强制类型转换,有可能造成数据精度的丢失。而在Swift中这两种方法是行不通的,我们需要通过一些函数进行显式地转换,代码如下:let historySco...
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编程语言 时间:
2014-09-05 10:01:41
阅读次数:
274
推荐使用Xcode6 playground的功能来测试,可以很方便看到输出 不需要分号 println("Hello,?world!") 简单的赋值方式 使用 let 标记一个常量 ??var 标记一个变量 var?myVariable?=?42
myVariable?=?50
l...
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编程语言 时间:
2014-09-04 15:12:59
阅读次数:
202
235B - Let's Play Osu!
Let us take a deep look in how this score is calculated. for a n long 'O' block, they contribute n2 to
answer.
Let us reformat this problem a bit and consider the foll...
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其他好文 时间:
2014-09-03 21:20:27
阅读次数:
369