iOS 开发中经常会遇到处理字符串的问题，对于一个字符串经常会遇见里面包含重复的字符需要对重复的字符进行处理，下面的代码就是对重复字符进行处理的操作，具体代码如下所示：
/**
* 返回重复字符的location
*
* @param text 初始化的字符串
* @param findText 查找的字符
*
* @return 返回重复字符的location
*/
- (NSMutableArray *)getRangeStr:(NSString *)text findText:(NSString *)findText {
NSMutableArray *arrayRanges = [NSMutableArray arrayWithCapacity:20];
if (findText == nil && [findText isEqualToString:@""]) {
return nil;
}
NSRange rang = [text rangeOfString:findText];
if (rang.location != NSNotFound && rang.length != 0) {
[arrayRanges addObject:[NSNumber numberWithInteger:rang.location]];
NSRange rang1 = {0,0};
NSInteger location = 0;
NSInteger length = 0;
for (int i = 0;; i++)
{
if (0 == i) {
location = rang.location + rang.length;
length = text.length - rang.location - rang.length;
rang1 = NSMakeRange(location, length);
}else
{
location = rang1.location + rang1.length;
length = text.length - rang1.location - rang1.length;
rang1 = NSMakeRange(location, length);
}
rang1 = [text rangeOfString:findText options:NSCaseInsensitiveSearch range:rang1];
if (rang1.location == NSNotFound && rang1.length == 0) {
break;
}else
[arrayRanges addObject:[NSNumber numberWithInteger:rang1.location]];
}
return arrayRanges;
}
return nil;
}
在开发中，如果遇到遍历不同字符串在字符串中的位置，可能有重复可能没有重复，为了避免重复遍历对字符串设置。。。需要设置一个全局字典，将要查的字符串加进数组中，第二次同样的字符串进入getRangeStr的时候，如果数组中包含这个字符串，直接return。
如下：
/**
* 返回重复字符的location
*
* @param text 初始化的字符串
* @param findText 查找的字符
*
* @return 返回重复字符的location
*/
- (NSMutableArray *)getRangeStr:(NSString *)text findText:(NSString *)findText {
if ([self.findTextArr containsObject:findText]) {// 避免重复查找同样的字符串
return nil;
}
[self.findTextArr addObjectSafe:findText];
NSMutableArray *arrayRanges = [NSMutableArray arrayWithCapacity:20];
if (findText == nil && [findText isEqualToString:@""]) {
return nil;
}
NSRange rang = [text rangeOfString:findText];
if (rang.location != NSNotFound && rang.length != 0) {
[arrayRanges addObject:[NSNumber numberWithInteger:rang.location]];
NSRange rang1 = {0,0};
NSInteger location = 0;
NSInteger length = 0;
for (int i = 0;; i++)
{
if (0 == i) {
location = rang.location + rang.length;
length = text.length - rang.location - rang.length;
rang1 = NSMakeRange(location, length);
}else
{
location = rang1.location + rang1.length;
length = text.length - rang1.location - rang1.length;
rang1 = NSMakeRange(location, length);
}
rang1 = [text rangeOfString:findText options:NSCaseInsensitiveSearch range:rang1];
if (rang1.location == NSNotFound && rang1.length == 0) {
break;
}else
[arrayRanges addObject:[NSNumber numberWithInteger:rang1.location]];
}
return arrayRanges;
}
return nil;
}