iOS NSString 字符串處理：截取字符串、匹配字符串、分隔字符串、拼接字符串、替換字符串

用到老是要去找，還是記下來方便！！！

 

1.截取字符串

NSString*string =@"tate_zwt";
string = [string substringToIndex:3];//截取下標7之后的字符串
WTLog(@"截取的值為：%@",string);


2.匹配字符串
NSString*string =@"tate_zwt";
NSRangerange = [stringrangeOfString:@"t"];//匹配得到的下標
WTLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取范圍類的字符串
WTLog(@"截取的值為：%@",string);


3.分隔字符串
NSString*string =@"tate_zwt_zwt";
NSArray *array = [string componentsSeparatedByString:@"_"]; //從字符A中分隔成2個元素的數組
WTLog(@"array:%@",array); //結果是3個對象分別是：tate、zwt、zwt

 

4.拼接字符串

NSMutableString *append =  [[NSMutableString alloc]init];

　[append appendString:@"我是"];

   [append appendString:@"tate-zwt"];

WTLog(@"%@",append);//輸出：我是tate-zwt

 

5.替換字符串

NSString *content = @"我是&nbsp tate-zwt";

 content = [content stringByReplacingOccurrencesOfString:@"&nbsp" withString:@""];

WTLog(@"%@",content);//輸出：我是tate-zwt