"mu-guest network: Basic Framework for iOS basics" learning notes < five > nsdicionary
Last Update:2015-07-22
Source: Internet
Author: User
<span id="Label3"></p><p><p></p></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span>Main<span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span>argc<span style="color: #0000ff;"><span style="color: #0000ff;">Const</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Char</span></span>*<span style="color: #000000;"><span style="color: #000000;">Argv[]) {</span></span><span style="color: #008080;"><span style="color: #008080;">2</span></span> <span style="color: #000000;"><span style="color: #000000;">@autoreleasepool {</span></span><span style="color: #008080;"><span style="color: #008080;">3</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">dictionary, stored memory is not contiguous with key and value (key Value)</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">KVC Key value encoding</span></span><span style="color: #008080;"><span style="color: #008080;">5</span></span>Nsdictionary *dic = [nsdictionary dictionarywithobject:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">1</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>Forkey:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">a</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">];</span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>, dic);<span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">the above methods are not commonly used</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Note that two parameters are arrays</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">nsdictionary *dic2 = [nsdictionary dictionarywithobjects:<# (nsarray *) #> forkeys:<# (NSArray *) #>] </span></span><span style="color: #008080;"><span style="color: #008080;">9</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">so we're going to create two arrays first</span> .</span><span style="color: #008080;"><span style="color: #008080;">Ten</span></span>Nsarray *array1 = [[nsarray alloc] initwithobjects:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">a</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">b</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">C</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">D</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, nil];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> one</span>Nsarray *array2 = [[nsarray alloc] initwithobjects:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">1</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">2</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">3</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">4</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, nil];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span>Nsdictionary *dic2 =<span style="color: #000000;"><span style="color: #000000;">[[nsdictionary alloc] initwithobjects:array1 forkeys:array2];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, dic2);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span>Nsdictionary *dic3 = @{<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">m</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">9</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">N</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">8</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">};</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, dic3);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">the length of the output dictionary</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span>Count = (<span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span><span style="color: #000000;"><span style="color: #000000;">) [dic3 count];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%d</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, count);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">get a value by key</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span>NSString *str = [dic3 valueforkey:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">m</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>];<span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">or [dic3 objectforkey:@ "m"]</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, str);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> at</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">gets the keys and values in all key values</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Nsarray *allvalue =<span style="color: #000000;"><span style="color: #000000;">[dic3 allvalues];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Nsarray *allkey =<span style="color: #000000;"><span style="color: #000000;">[dic3 allKeys];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;">the <span style="color: #008000;">value is found by multiple keys, because there are multiple, and of course the returned array</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Nsarray *array = [dic2 Objectsforkeys:[nsarray arraywithobjects:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">2</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">3</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>,<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">9</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span>, nil] Notfoundmarker:<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;">not <span style="color: #800000;">found</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, array);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> in</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">iterate through the dictionary, the array is traversed by subscript, and the dictionary is, of course, traversed by Key.</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> for</span>(nsstring *key<span style="color: #0000ff;"><span style="color: #0000ff;">inch</span></span><span style="color: #000000;"><span style="color: #000000;">Dic2) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> to</span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">%@ = %@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, Key,[dic2 objectforkey:key]);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">using an enumerator for dictionaries</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span>Nsenumerator *en =<span style="color: #000000;"><span style="color: #000000;">[dic2 keyenumerator];</span></span><span style="color: #008080;"><span style="color: #008080;"></span> *</span> <span style="color: #0000ff;"><span style="color: #0000ff;">ID</span></span>Key =<span style="color: #000000;"><span style="color: #000000;">nil;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> $</span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> while</span>(key =<span style="color: #000000;"><span style="color: #000000;">[en Nextobject]) {</span></span><span style="color: #008080;"><span style="color: #008080;">Panax Notoginseng</span></span>NSLog (<span style="color: #800000;"><span style="color: #800000;">@"</span></span><span style="color: #800000;"><span style="color: #800000;">key-%@</span></span><span style="color: #800000;"><span style="color: #800000;">"</span></span><span style="color: #000000;"><span style="color: #000000;">, key);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">There is also a block method, the usage is the same</span></span><span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008000;"><span style="color: #008000;">/*</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #008000;"><span style="color: #008000;">[dic2 enumeratekeysandobjectsusingblock:^ (id key, ID obj, BOOL *STOP) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span> <span style="color: #008080;"><span style="color: #008080;"></span> +</span> <span style="color: #008000;"><span style="color: #008000;"> }];</span></span><span style="color: #008000;"><span style="color: #008000;">*/</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> $</span> <span style="color: #0000ff;"><span style="color: #0000ff;">return</span></span> <span style="color: #800080;"><span style="color: #800080;">0</span></span><span style="color: #000000;"><span style="color: #000000;">;</span></span><span style="color: #008080;"><span style="color: #008080;"></span> $</span>}</pre><p><p></p></p><p><p>"mu-guest network: Basic Framework for iOS basics" learning notes < five > nsdicionary</p></p></span>
