iOS Learning Road of Objective-c (iii)--nsmutablestring

2. Nsmutablestring creation of mutable strings

   1     nsmutablestring *string1 = [[nsmutablestring alloc] init]; 2     // string2 Object methods are created, String3 are created by class methods 3     nsmutablestring *string2 = [[Nsmutablestring alloc] initwithcapacity:0]; 4     nsmutablestring *string3 = [nsmutablestring stringwithcapacity:0];

3. Adding a String

   1Nsmutablestring *string=[[Nsmutablestring alloc] init];2     //-(void) appendString: (NSString *) astring;3     //function: Added after a string without creating a new string4[stringAppendString:@"bei Jing Ying nin"];5NSLog (@"%@",string);6     //-(void) insertstring: (NSString *) astring Atindex: (nsuinteger) loc;7     //role: Inserting a string at a location in a string8[stringInsertstring:@"Huan"Atindex:8];9NSLog (@"%@",string);

4. Deletion of strings

   Nsmutablestring *string=[[Nsmutablestring alloc] init]; [stringAppendString:@"bei Jing Huan Ying Nin"]; NSLog (@"%@",string); //-(void) Deletecharactersinrange: (nsrange) range; //role: Deletion of stringsNsrange range = {1,5}; [stringDeletecharactersinrange:range]; NSLog (@"%@",string);

iOS Learning Road of Objective-c (iii)--nsmutablestring