NSString *tempA = @"123"; NSString *tempB = @"456";

 NSString *newString = [NSString stringWithFormat:@"%@%@",tempA,tempB];

int intString = [newString intValue];

NSString *stringInt = [NSString stringWithFormat:@"%d",intString];

 float floatString = [newString floatValue];

NSString *stringFloat = [NSString stringWithFormat:@"%f",intString];

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

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);

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