115，字符串替代

#import <Foundation/Foundation.h>

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

/*

OccurrencesOfString:被替换者，

withString：替换者

*/

NSString *str =
@"http:$$www.baidu.com$content$1012.html";

NSString *newStr = [str
stringByReplacingOccurrencesOfString:@"$"
withString:@"/"];

NSLog(@"newStr = |%@|",newStr);

/*

首尾替换

*/

NSString *str1 =
@" http://www.baidu.com/content/1012.html ";

NSCharacterSet *set = [NSCharacterSet
whitespaceCharacterSet];

NSString *newStr1 = [str1
stringByTrimmingCharactersInSet:set];

NSLog(@"newStr1 = |%@|",newStr1);

return 0;

}

//2015-12-20 10:17:17.734 10，字符串替换[1143:119825] newStr = |http://www.baidu.com/content/1012.html|

//2015-12-20 10:17:17.735 10，字符串替换[1143:119825] newStr1 = |http://www.baidu.com/content/1012.html|

//Program ended with exit code: 0