OC字符串的截取和替换

来源：互联网发布：高校大数据课程编辑：程序博客网时间：2024/06/10 09:05

截取字符串:

1.从指定位置(参数from)开始截取,截取到最后

包含指定位置的字符

- (NSString *)substringFromIndex:(NSUInteger)from;

2.从开头开始截取,到指定位置结束

不包含指定位置

- (NSString *)substringToIndex:(NSUInteger)to;

3.截取指定范围内的字符串

传入一个range,包含range上loc的字符

- (NSString *)substringWithRange:(NSRange)range;

字符串的替换:

- (NSString *)stringByReplacingOccurrencesOfString:要替换掉的字符串 withString:拿来替换的字符串;

#import <Foundation/Foundation.h>

int main(int argc,const char * argv[]) {

@autoreleasepool {

NSString *str =@"yueyue teacher is so cool,i want to give you birth monkey,teacher";

//teacher --> goodMan

NSString *str1 = [strstringByReplacingOccurrencesOfString:@"teacher"withString:@"goodMan"];

NSLog(@"%@",str1);

//1)将http:**ios.itcast.cn*ios*images*content_25.jpg中的*替换为/

NSString *str2 =@"http:**ios.itcast.cn*ios*images*content_25.jpg";

NSString *str3 = [str2stringByReplacingOccurrencesOfString:@"*"withString:@"/"];

NSLog(@"%@",str3);

//2)将" http:** ios.itcast.cn *ios*images* content_25.jpg "的空格去掉,并且将*替换为/

NSString *str4 =@" http:** ios.itcast.cn *ios*images* content_25.jpg ";

NSString *str5 = [str4stringByReplacingOccurrencesOfString:@" "withString:@""];

NSLog(@"%@",str5);

NSString *str6 = [str5stringByReplacingOccurrencesOfString:@"*"withString:@"/"];

NSLog(@"%@",str6);

}

return0;

}

void priTest2(){

//将标签内的字符串取出来 <itcast>传智播客</itcast>

NSString *str =@"<itcast>传智播客</itcast>";

NSRange range1 = [strrangeOfString:@">"];//获得>的位置

NSUInteger loc = range1.location+1;//所以,传智播客的传的位置是>的位置+1

NSRange range2 = [strrangeOfString:@"</"];

NSUInteger length = range2.location - loc;//</的位置减去传的位置,就是传智播客的长度

NSRange range =NSMakeRange(loc, length);

NSString *str1 = [strsubstringWithRange:range];

NSLog(@"%@",str1);

}

void priTest(){

//将标签内的字符串取出来 <itcast>传智播客</itcast>

NSString *str =@"<itcast>哈哈啊哈哈哈哈哈啊哈哈哈</itcast>";

//先拿到>再拿到</

NSRange range1 = [strrangeOfString:@">"];

NSUInteger loc1 = range1.location;

NSLog(@"%lu",loc1);

//传智播客</itcast>

NSString *str1 = [strsubstringFromIndex:loc1+1];

NSLog(@"%@",str1);

NSRange range2 = [str1rangeOfString:@"</"];

NSUInteger loc2 = range2.location;

NSLog(@"%lu",loc2);

NSString *str2 = [str1substringToIndex:loc2];

NSLog(@"%@",str2);

}

void subString(){

//,是25 i是26

NSString *str1 =@"yueyue teacher is so cool,i want to give you birth monkey,teacher";

//截取第一个逗号右边的(后半段)

NSString *str2 = [str1substringFromIndex:26];

NSLog(@"%@",str2);

//截取第一个逗号左边的(前半段)

//不包含25

NSString *str3 = [str1substringToIndex:25];

NSLog(@"%@",str3);

//截取两个逗号之间的内容(中间)

NSString *str4 = [str1substringWithRange:NSMakeRange(26,31)];

NSLog(@"%@",str4);

NSString *str5 = [str1substringFromIndex:26];

NSLog(@"%@",str5);

NSString *str6 = [str5substringToIndex:31];

NSLog(@"%@",str6);

}

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