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NSString是定义固定大小的字符串，NSMutableString可变，可对字符串做增、删、改、插入等操作。
源代码strings.m
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#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];// insert code here...NSString *artist = @"Underworld";
NSLog(@"The \"%@\" length is %d",artist,[artist length]);NSString *substring = [artist substringFromIndex:5];NSLog(@"From index 5 to end that substring is \"%@\"",substring);NSRange range = [artist rangeOfString:@"w"];
NSLog(@"range.location = %d,是字母\"w\"所在的索引位置",range.location);
NSLog(@"range.length = %d,是字母\"w\"的长度",range.length);NSLog(@"------------------------------");NSString *song = @"美丽新世界,伍佰";
NSRange range1 = [song rangeOfString:@","];
NSString *songName = [song substringToIndex:range1.location];
NSString *songAuthor = [song substringFromIndex:range1.location + range1.length]; //如果不加上range1.length,取词就包含逗号NSLog(@"歌曲:%@",song);
NSLog(@"\",\"号位置为 %d",range1.location);
NSLog(@"歌名:%@",songName);
//printf("歌名:%s \n",[songName UTF8String]);//正确
//NSLog(@"歌名:%@", [songName UTF8String]);//错误
NSLog(@"作者:%@",songAuthor);NSLog(@"---------------------------------");
NSLog(@"可变字符串类NSMultableString演示:");NSMutableString *movie = [[NSMutableString alloc] initWithString:@"变形金刚2"];NSLog(@"%@",movie);[movie appendString:@",派拉蒙影业"];
NSLog(@"%@.方法appendString",movie);NSRange range2 = [movie rangeOfString:@"派拉蒙影业"];
[movie replaceCharactersInRange:range2 withString:@"派拉蒙电影公司"]; //不是range2.location
NSLog(@"%@.方法replaceCharactersInRange",movie);[movie deleteCharactersInRange:[movie rangeOfString:@"公司"]];
NSLog(@"%@.方法deleteCharactersInRange",movie);range2 = [movie rangeOfString:@"变形金刚"];
[movie insertString:@"科幻电影:" atIndex:range2.location];
NSLog(@"%@.方法insertString",movie);[movie release]; //采用alloc的对象都不要忘记release
[pool drain];return 0;
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