版本記錄

前言

前面我簡單的寫了些NSString的初始化厕倍，寫了幾篇刚夺，都不難者蠕，但是可以對新手有一定的小幫助咧党，對于大神級人物可以略過這幾篇逊朽，NSString本來就沒有難的，都是細枝末節(jié)砰逻，忘記了查一下就會了旋恼，沒有技術(shù)難點，下面我們繼續(xù)~~~
1. NSString簡單細說（一）—— NSString整體架構(gòu)
2. NSString簡單細說（二）—— NSString的初始化
3. NSString簡單細說（三）—— NSString初始化
4. NSString簡單細說（四）—— 從URL初始化
5. NSString簡單細說（五）—— 向文件或者URL寫入
6. NSString簡單細說（六）—— 字符串的長度
7. NSString簡單細說（七）—— 與C字符串的轉(zhuǎn)化
8. NSString簡單細說（八）—— 識別和比較字符串
9. NSString簡單細說（九）—— 字符串的合并
10. NSString簡單細說（十）—— 字符串的分解
11. NSString簡單細說（十一）—— 字符串的查找

字符串的替換

一统台、- (NSString ***)stringByReplacingOccurrencesOfString:(NSString ****)target withString:(NSString ***)replacement;

直接看代碼

    /**
     * 1. - (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement;
     *
     *  @param target:The string to replace.
     *  @param replacement:The string with which to replace target.
     *
     *  @reuturn: A new string in which all occurrences of target in the receiver are replaced by replacement.
     */
    
    //字符串
    NSString *testStr = @"212eAhohgivAieye0oAhsoIFIFUFAYDSAT";
    NSString *resultStr = [testStr stringByReplacingOccurrencesOfString:@"A" withString:@"--"];
    NSLog(@"resultStr = %@",resultStr);

看輸出結(jié)果

2017-05-25 01:14:25.253 NSString你會用嗎雕擂？[3122:140209] resultStr = 212e--hohgiv--ieye0o--hsoIFIFUF--YDS--T

結(jié)論：簡單且容易理解。

二贱勃、- (NSString *****)stringByReplacingOccurrencesOfString:(NSString *****)target withString:(NSString ***)replacement options:(NSStringCompareOptions)options range:(NSRange)searchRange;

這個方法有四個參數(shù)我們先看一下參數(shù)：

方法參數(shù)

這里參數(shù)NSStringCompareOptions是一個枚舉井赌，是對替換方法的選項參數(shù)進行配置的。這個其實大家都很熟悉了贵扰，在說到字符串的比較時仇穗，說過這個枚舉值，這里只給出大家列出來戚绕，自己看吧纹坐。如果不考慮這個參數(shù)的限制可以傳入0。

typedef NS_OPTIONS(NSUInteger, NSStringCompareOptions) {
    NSCaseInsensitiveSearch = 1,
    NSLiteralSearch = 2,        /* Exact character-by-character equivalence */
    NSBackwardsSearch = 4,      /* Search from end of source string */
    NSAnchoredSearch = 8,       /* Search is limited to start (or end, if NSBackwardsSearch) of source string */
    NSNumericSearch = 64,       /* Added in 10.2; Numbers within strings are compared using numeric value, that is, Foo2.txt < Foo7.txt < Foo25.txt; only applies to compare methods, not find */
    NSDiacriticInsensitiveSearch NS_ENUM_AVAILABLE(10_5, 2_0) = 128, /* If specified, ignores diacritics (o-umlaut == o) */
    NSWidthInsensitiveSearch NS_ENUM_AVAILABLE(10_5, 2_0) = 256, /* If specified, ignores width differences ('a' == UFF41) */
    NSForcedOrderingSearch NS_ENUM_AVAILABLE(10_5, 2_0) = 512, /* If specified, comparisons are forced to return either NSOrderedAscending or NSOrderedDescending if the strings are equivalent but not strictly equal, for stability when sorting (e.g. "aaa" > "AAA" with NSCaseInsensitiveSearch specified) */
    NSRegularExpressionSearch NS_ENUM_AVAILABLE(10_7, 3_2) = 1024    /* Applies to rangeOfString:..., stringByReplacingOccurrencesOfString:..., and replaceOccurrencesOfString:... methods only; the search string is treated as an ICU-compatible regular expression; if set, no other options can apply except NSCaseInsensitiveSearch and NSAnchoredSearch */
};

下面還是直接看代碼舞丛。

    /**
     * 2. - (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement options:(NSStringCompareOptions)options range:(NSRange)searchRange;
     *
     *  @param target:The string to replace.
     *  @param replacement:The string with which to replace target.
     *  @param options:A mask of options to use when comparing target with the receiver. Pass 0 to specify no options.
     *  @param searchRange:The range in the receiver in which to search for target.
     *
     *  @reuturn: A new string in which all occurrences of target, matched using options, in searchRange of the receiver are replaced by replacement.
     */
    
    //例1
    NSString *testStr1 = @"2a12eAhohgivAieye0oAhsoIaFIFUFAYDSAT";
    NSString *resultStr1 = [testStr1 stringByReplacingOccurrencesOfString:@"A" withString:@"--" options:NSCaseInsensitiveSearch range:NSMakeRange(0, testStr1.length)];
    NSLog(@"resultStr1 = %@",resultStr1);
    
    //例2
    NSString *testStr = @"2a12eAhohgivAieye0oAhsoIaFIFUFAYDSAT";
    NSString *resultStr = [testStr stringByReplacingOccurrencesOfString:@"A" withString:@"--" options:NSCaseInsensitiveSearch range:NSMakeRange(0, 5)];
    NSLog(@"resultStr = %@",resultStr);

看輸出結(jié)果

2017-05-25 23:02:15.045 NSString你會用嗎耘子？[1330:37453] resultStr1 = 2--12e--hohgiv--ieye0o--hsoI--FIFUF--YDS--T
2017-05-25 23:02:15.046 NSString你會用嗎？[1330:37453] resultStr = 2--12eAhohgivAieye0oAhsoIaFIFUFAYDSAT

結(jié)論：注意例1中是不區(qū)分大小寫的全部長度字符串的替換球切，例2中是不區(qū)分大小寫的length = 5的字符串的替換谷誓。

三、- (NSString *)stringByReplacingCharactersInRange:(NSRange)range withString:(NSString *)replacement;

直接看代碼吧欧聘。

    /**
     * 3. - (NSString *)stringByReplacingCharactersInRange:(NSRange)range withString:(NSString ***)replacement;
     *
     *  @param range:A range of characters in the receiver
     *  @param replacement:The string with which to replace target.
     *
     *  @reuturn: A new string in which the characters in range of the receiver are replaced by replacement.
     */
    
    //例1
    NSString *testStr1 = @"2a12eAhohgivAieye0oAhsoIaFIFUFAYDSAT";
    NSRange range1 = NSMakeRange(0, testStr1.length);
    NSString *resultStr1 = [testStr1 stringByReplacingCharactersInRange:range1 withString:@"--"];
    NSLog(@"resultStr1 = %@",resultStr1);
    
    //例2
    NSString *testStr = @"2a12eAhohgivAieye0oAhsoIaFIFUFAYDSAT";
    NSRange range = NSMakeRange(0, 2);
    NSString *resultStr = [testStr stringByReplacingCharactersInRange:range withString:@"--"];
    NSLog(@"resultStr = %@",resultStr);

看輸出結(jié)果

2017-05-25 23:12:56.140 NSString你會用嗎片林？[1463:43995] resultStr1 = --
2017-05-25 23:12:56.141 NSString你會用嗎？[1463:43995] resultStr = --12eAhohgivAieye0oAhsoIaFIFUFAYDSAT

結(jié)論：這個很簡單了吧怀骤，都能看懂费封，例1就是將全部長度的字符串替換為指定的字符串，例2是將指定長度和位置的字符串替換為指定的字符串蒋伦。

后記

慢慢來弓摘，一個一個的大家說，未完痕届，待續(xù)~~~

思念