objective-C语言_对可变字符串操作的常用方法

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#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {    @autoreleasepool {           //可变字符串   NSMutableString        NSMutableString *mString = [NSMutableString stringWithString:@"nihao"];                NSMutableString *mString1 = [NSMutableString stringWithFormat:@"hello%d",100];                //从本地读取文件        NSMutableString *mString2 = [NSMutableString stringWithContentsOfFile:@"" encoding:NSUTF8StringEncoding error:nil];                NSURL *url = [NSURL URLWithString:@""];        NSMutableString *mString3 = [NSMutableString stringWithContentsOfURL:url encoding:4 error:nil];                //可变字符串独特初始化方法，初始化一个空间为100的可变字符串        NSMutableString *mString4 = [[NSMutableString alloc]initWithCapacity:100];                //C语言的字符数组转成OC的字符串//        [[NSString alloc]initWithCharacters:<#(nonnull const unichar *)#> length:<#(NSUInteger)#>]                NSMutableString *targetString = [NSMutableString stringWithString:@"呵呵，我靠"];                NSRange range = [targetString rangeOfString:@"靠"];        NSLog(@"%@",[NSValue valueWithRange:range]);                //替代        [targetString replaceCharactersInRange:range withString:@"*"];        NSLog(@"targetString = %@",targetString);                //增加        //在指定位置去插入一个字符串        [targetString insertString:@"你是sb么" atIndex:targetString.length];        NSLog(@"targetString = %@",targetString);                //在字符串的末尾添加一个字符串        [targetString appendString:@",byebye"];        NSLog(@"targetString = %@",targetString);                [targetString appendFormat:@"%@%@",@",your mother",@"boom boom"];        NSLog(@"targetString = %@",targetString);                        //删除        [targetString deleteCharactersInRange:NSMakeRange(0, 3)];        NSLog(@"%@",targetString);                    }    return 0;}
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