弄乱NSString的顺序的快速方法? [英] Quick way to jumble the order of an NSString?

问题描述

有人知道改变现有NSString或NSMutableString字符顺序的现有方法吗?无论如何，我都有一个解决方法，但是如果有一种现有的方法，那将是很好的.

Does anyone know of an existing way to change the order of an existing NSString or NSMutableString's characters? I have a workaround in mind anyway but it would be great if there was an existing method for it.

例如，给定字符串@"HORSE"，该方法将返回@"ORSEH"，@"SORHE"，@"ROHES"等吗?

For example, given the string @"HORSE", a method which would return @"ORSEH", @"SORHE", @"ROHES", etc?

推荐答案

请考虑以下代码:
.h文件:

Consider this code:
.h File:

@interface NSString (Scrambling)

+ (NSString *)scrambleString:(NSString *)toScramble;

@end

.m文件:

@implementation NSString (Scrambling)

+ (NSString *)scrambleString:(NSString *)toScramble {
   for (int i = 0; i < [toScramble length] * 15; i ++) {
      int pos = arc4random() % [toScramble length];
      int pos2 = arc4random() % ([toScramble length] - 1);
      char ch = [toScramble characterAtIndex:pos];
      NSString *before = [toScramble substringToIndex:pos];
      NSString *after = [toScramble substringFromIndex:pos + 1];
      NSString *temp = [before stringByAppendingString:after];
      before = [temp substringToIndex:pos2];
      after = [temp substringFromIndex:pos2];
      toScramble = [before stringByAppendingFormat:@"%c%@", ch, after];
   }
   return toScramble;
}

@end

不是最漂亮的代码或执行，但是可以完成工作.可能有一种(const char *)方式，但这对我来说很好.快速测试显示在Mac上执行的时间为0.001021秒.

Not the most beautiful code or execution, but gets the job done. There's probably a (const char *) way to do this, but this works fine for me. A quick test shows a 0.001021 second length for execution on my Mac.

用法:

NSString *scrambled = [NSString scrambleString:otherString];

从另一种语言/伪代码改编的代码

Code adapted from another language / pseudocode

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