IOS筆記之可變字串

NSMutableString是NSString的子類。

1.追加字串

NSMutableString *str = [[NSMutableString alloc] initWithCapacity:10];
[str setString:@"Hello"];

[str appendString:@" World"];
NSLog(@"str = %@",str);
[str appendFormat:@"- %d",10];
NSLog(@"str= %@",str);

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2.替換字串

NSRange range = [str rangeOfString:@"World"];
[str replaceCharactersInRange:range withString:@"IOS"];
NSLog(@"str =%@",str);
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3.插入字串

[str insertString:@" android " atIndex:6];
NSLog(@"str = %@",str);
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4.刪除字串

NSRange range1 = [str rangeOfString:@"Hello"];
[str deleteCharactersInRange:range1];
NSLog(@"str = %@",str);
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