IOS Foundation框架基本类库的使用 NSMutableString

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NSMutableString + 方法

//创建一个字符串空串容量为指定capacity大小

+(id)stringWithCapacity:(NSUInteger)capacity;

NSMutableString *str = [NSMutableString stringWithCapacity:10];

//创建一个空的子串（继承自父类的方法）

+(instancetype)string;

NSMutableString *str = [NSMutableString string];

//创建一个字符串空串容量为指定capacity大小

- (id)initWithCapacity:(NSUIteger)capacity;

NSMutableString *str = [[NSMutableString alloc] initWithCapacity:10];

//在指定标签位置插入一个字符串对象

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

NSMutableString *str = [NSMutableString stringWithFormat:@"hello world"];

[str insertString:@"beautiful " atIndex:6];

NSLog(@"%@", str);

输出:hello beautiful world;

删除主串中的某一指定范围的字符

- (void)deleteCharactersInRange:(NSRange)range;

NSMutableString *str = [NSMutableString stringWithFormat:@"hello world"];

NSRange range = {2, 3};

[str deleteCharactersInRange:range];

NSLog(@"%@", str);

输出:he world;

//拼接字符串

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

NSString *str1 = @"world";

NSMutableString *str2 = [NSMutableString stringWithFormat:@"hello "];

[str2 appendString:str1];

NSLog(@"%@", str2);

输出:hello world;

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

NSMutableString *str = [NSMutableString stringWithFormat:@"hello "];

[str appendFormat:@"%@", @"world"];

NSLog(@"%@", str);

输出:hello world;

将字符串对象赋值

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

NSMutableString *str = [NSMutableString stringWithFormat:@"hello"];

[str setString:@"world"];

NSLog(@"%@", str);

输出:world;

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