OC基础使用(五 NSMutableString 可变字符串)

NSMutableString 可变字符串
1.创建对象(常用)
NSMutableString *string = [[NSMutableString alloc] initWithCapacity:0];
2.设置值
[string setString:@"Objective-C"];
3.根据下标插入值
[string insertString:@"学习 " atIndex:0];
4.追加字符串
[string appendString:@" "];
[string appendFormat:@"%.1f",2.0f];
5.替换字符串
NSRange range = [string rangeOfString:@"学习 "];
[string replaceCharactersInRange:range withString:@"study "];
6.删除
[string deleteCharactersInRange:NSMakeRange(0, 6)];