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| <?xml version="1.0" encoding="utf-8"?> | ||
| <feed xmlns="http://www.w3.org/2005/Atom"> | ||
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| <title><![CDATA[Category: object-c | Mike Tech]]></title> | ||
| <link href="http://mikegao.github.com/blog/categories/object-c/atom.xml" rel="self"/> | ||
| <link href="http://mikegao.github.com/"/> | ||
| <updated>2013-02-06T17:31:49+08:00</updated> | ||
| <id>http://mikegao.github.com/</id> | ||
| <author> | ||
| <name><![CDATA[Mike Gao]]></name> | ||
| <email><![CDATA[mike.gao0611@gmail.com]]></email> | ||
| </author> | ||
| <generator uri="http://octopress.org/">Octopress</generator> | ||
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| <entry> | ||
| <title type="html"><![CDATA[Object-C 数据类型和表达式]]></title> | ||
| <link href="http://mikegao.github.com/blog/objc-datatype/"/> | ||
| <updated>2013-02-06T14:13:00+08:00</updated> | ||
| <id>http://mikegao.github.com/blog/objc-datatype</id> | ||
| <content type="html"><![CDATA[<h2>I. Int类型</h2> | ||
| <h3>1.八进制</h3> | ||
| <p>如果第一位是0，则表示8进制 | ||
| NSlog调用格式字符串使用格式符号%o，显示的值不带有前导0，使用%#o将显示前导0</p> | ||
| <h3>2.十六进制</h3> | ||
| <p>0x开头表示16进制 | ||
| <code>objc | ||
| rgbColor = 0xFFEF0D; | ||
| </code> | ||
| NSlog调用格式字符串使用格式符号%x，显示的值不带有前导0x，使用%#X或%X将显示前导0x</p> | ||
| <h2>II. Float类型</h2> | ||
| <p>要使用科学计数法，NSLog格式字符串中指定格式字符%e，使用NSLog格式字符串%g允许NSLog确定使用常用的浮点计数法</p> | ||
| <h3>III. Double类型</h3> | ||
| <p>要显示double值，可用格式符号%f, %e或%g，它们与显示float值所用的格式符号是相同的。</p> | ||
| <h3>IV. char类型</h3> | ||
| <p>将字符放入一对单引号中就能得到字符常量 | ||
| 字符常量是放在单引号中的单个字符，字符串则是放在双引号中的任意个字符。前面有@字符并且放在双引号中的字符串是NSString字符串对象。 | ||
| 在NSLog调用中可以使用格式字符%c。</p> | ||
| <p>``` objc | ||
| int intergerVar = 100; | ||
| float floatingVar = 331.79; | ||
| double doubleVar = 8.44e+11; | ||
| char charVar = 'W';</p> | ||
| <p>NSLog(@"integerVar = %i", integerVar); | ||
| NSLog(@"floatingVar = %f", floatingVar); | ||
| NSLog(@"doubleVar = %e", doubleVar); | ||
| NSLog(@"doubleVar = %g", doubleVar); | ||
| NSLog(@"charVar = %c", charVar); | ||
| ```</p> | ||
| <p>``` objc | ||
| long int numberOfPoints = 131071100L; | ||
| NSLog(@"long int = %li", numberOfPoints);</p> | ||
| <p>short int number = 123; | ||
| NSLog(@"shot int = %hi", number);</p> | ||
| <p>unsigned int counter; // 变量counter只用于保存正值 | ||
| //0x00ffU | ||
| 200000UL //将常量20000看作unsigned long | ||
| ```</p> | ||
| <p><code>objc | ||
| -(id) newObject: (int) type; // 声明一个名为newObject的实例方法，它具有名为type的单个整型参数并有id类型的返回值。 | ||
| </code></p> | ||
| ]]></content> | ||
| </entry> | ||
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| <entry> | ||
| <title type="html"><![CDATA[Object-C 类、对象和方法]]></title> | ||
| <link href="http://mikegao.github.com/blog/object-c-class/"/> | ||
| <updated>2013-02-06T11:33:00+08:00</updated> | ||
| <id>http://mikegao.github.com/blog/object-c-class</id> | ||
| <content type="html"><![CDATA[<p>``` objc 采用特定的语法对类和实例应用方法 | ||
| [ClassOrInstance method]; | ||
| // 在这条语句中，左方括号后要紧跟类的名称或者该类的实例的名称，它后面可以是一个或多个空格，空格后面是将要执行的方法。最后使用右方括号和结束分号来中止。</p> | ||
| <p>yourCar = [Car new];</p> | ||
| <p>[yourCar prep]; // 准备好第一次使用 | ||
| [yourCar drive]; // 驾驶汽车 | ||
| [yourCar wash]; // 洗车 | ||
| [yourCar getGase]; // 如果需要就给汽车加油 | ||
| [yourCar service]; // 维修</p> | ||
| <p>[yourCar topDown]; // 是否为一辆敞蓬车 | ||
| [yourCar topUp]; | ||
| currentMileage = [yourCar cruuentOdometer]; | ||
| ```</p> | ||
| <p>``` objc Interface | ||
| @interface NewClassName: ParentClassName | ||
| {</p> | ||
| <pre><code>memberDeclarations; | ||
| </code></pre> | ||
| <p>} | ||
| methodDeclarations; | ||
| @end</p> | ||
| <p>//---- @interface section ---- | ||
| // 用于描述类、类的数据成分以及类的方法 | ||
| @interface Fraction: NSObject{</p> | ||
| <pre><code>int numerator; | ||
| int denominator; | ||
| </code></pre> | ||
| <p>}</p> | ||
| <p>-(void) print; // 开头的负号（-）通知编译器，这是一个实例方法 （+）表示为类方法 | ||
| -(void) setNumberator: (int) n; | ||
| -(void) setDenominator: (int) d;</p> | ||
| <p>@end | ||
| ```</p> | ||
| <p>``` objc Implementation | ||
| //---- @implementaion section ---- | ||
| // 实现interface方法的实际代码 | ||
| @implementation Fraction</p> | ||
| <p>-(void) print{</p> | ||
| <pre><code>NSLog(@"%i/%i", numerator, denominator); | ||
| </code></pre> | ||
| <p>}</p> | ||
| <p>-(void) setNumberator:(int)n{</p> | ||
| <pre><code>numerator = n; | ||
| </code></pre> | ||
| <p>}</p> | ||
| <p>-(void) setDenominator:(int)d{</p> | ||
| <pre><code>denominator = d; | ||
| </code></pre> | ||
| <p>}</p> | ||
| <p>@end | ||
| ```</p> | ||
| <p>``` objc main | ||
| Fraction <em>myFraction; // myFraction用于存储来自新的Fraction类变量 （</em>）是必须的，表示myFraction是对Fraction的一个引用（或者指针）</p> | ||
| <p>// Create an instance of a Fraction | ||
| myFraction = [Fraction alloc]; // alloc是allocate的缩写，分配内存空间 | ||
| myFraction = [myFraction init]; | ||
| // 亦可写成 | ||
| // myFraction = [[Fraction alloc] init]; | ||
| // 最终简写形式 | ||
| // Fraction <em>myFraction = [[Fraction alloc] init]; | ||
| // 以上都扯淡 | ||
| Fraction </em>myFraction = [Fraction new];</p> | ||
| <p>// Set fraction to 1/3 | ||
| [myFraction setNumberator: 1]; | ||
| [myFraction setDenominator: 3];</p> | ||
| <p>// Display the fraction using the print method</p> | ||
| <p>NSLog(@"The value of myFraction is:"); | ||
| [myFraction print];</p> | ||
| <p>```</p> | ||
| ]]></content> | ||
| </entry> | ||
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| </feed> |
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