ios 字符串處理：截取字符串、匹配字符串、分隔字符串

1.截取字符串

NSString*string =@"sdfsfsfsAdfsdf";
string = [string substringToIndex:7];//截取掉下標7之后的字符串
NSLog(@"截取的值為：%@",string);
[string substringFromIndex:2];//截取掉下標2之前的字符串
NSLog(@"截取的值為：%@",string);


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


3.分隔字符串
NSString*string =@"sdfsfsfsAdfsdf";

NSArray *array = [string componentsSeparatedByString:@"A"]; //從字符A中分隔成2個元素的數組
NSLog(@"array:%@",array); //結果是adfsfsfs和dfsdf