iOS学习笔记（一）－－－NSMutableString可变数组

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其余NSString的区别：

1、是一个可变的字符串

2、可以添加、删除、替换字符串

3、继承了NSString

@interface NSMutableString : NSString

基本操作

基本方法包括：初始化

- (NSMutableString *)initWithCapacity:(NSUInteger)capacity;+ (NSMutableString *)stringWithCapacity:(NSUInteger)capacity;//静态方法，推荐使用：不用考虑释放内存

插入

- (void)insertString:(NSString *)aString atIndex:(NSUInteger)loc;

删除

- (void)deleteCharactersInRange:(NSRange)range;

添加

- (void)appendString:(NSString *)aString;- (void)appendFormat:(NSString *)format, ... NS_FORMAT_FUNCTION(1,2);

替换

- (void)setString:(NSString *)aString;

具体使用示例：

        //1、初始化        NSMutableString *str = [NSMutableString stringWithCapacity:20];        //2、添加        [str appendString:@"Hello"];        [str appendString:@" World!"];        NSLog(@"%@",str);                //3、删除字符        NSRange r = NSMakeRange(3, 3);        [str deleteCharactersInRange:r];                NSLog(@"%@",str);                //4、插入字符        NSString *str1 = @"Gugu";                NSMutableString *str2 = [NSMutableString stringWithFormat:@"hello "];        [str2 insertString:str1 atIndex:6];        NSLog(@"%@",str2);                //5、替换        [str2 setString:@"hello world!"];        NSLog(@"%@",str2);

运行结果：

2016-02-19 20:02:57.340 Objective－C[18778:1131913] Hello World!2016-02-19 20:02:57.341 Objective－C[18778:1131913] HelWorld!2016-02-19 20:02:57.341 Objective－C[18778:1131913] hello Gugu2016-02-19 20:02:57.341 Objective－C[18778:1131913] hello world!Program ended with exit code: 0

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