计算NSString含有多少个相同字符串

//

//  NSString+NSStringExt.m

//  01-NSString类

//

//  Created by apple on 14-3-20.

//  Copyright (c) 2014年 apple. All rights reserved.

//

#import "NSString+NSStringExt.h"

@implementation NSString (NSStringExt)

- (int)calculateSubStringCount:(NSString *)str

{

////@"abcd123abcdrgabc"

//@"abc"

int count = 0;

NSRange range = [self rangeOfString:str];

if (range.location == NSNotFound)

{

return count;

}

//声明一个临时字符串,记录截取之后的字符串

NSString * subStr = self;

while (range.location != NSNotFound) {

//只要进入循环就要count++

count++;

//每次记录之后,把找到的字串截取掉

//range.location + range.length 得出的结果就是我们要截取的字符串起始索引的位置

subStr = [subStr substringFromIndex:range.location + range.length];

NSLog(@"subStr %@",subStr);

//每一次截取之后,要判断一些,截取完成剩余部分字符串,是否还有子串存在

//如果存在,我们的while循环会继续运行,如果不存在while循环结束

range = [subStr rangeOfString:str];

NSLog(@"rang %@",NSStringFromRange(range));

NSLog(@"location=%lu",range.location);

}

return count;

}

@end