关于ios:iOS之字符串处理截取字符串匹配字符串分隔字符串大小写转换

1.截取字符串

NSString *string =@"123456d890";NSString *str1 = [string substringToIndex:5];//截取掉下标5之前的字符串NSLog(@"截取的值为：%@",str1); NSString *str2 = [string substringFromIndex:3];//截取掉下标3之后的字符串NSLog(@"截取的值为：%@",str2);

2.匹配字符串

NSString *string =@"sd是sfsfsAdfsdf";NSRange range = [string rangeOfString:@"Ad"];//匹配失去的下标NSLog(@"rang:%@",NSStringFromRange(range));string = [string substringWithRange:range];//截取范畴内的字符串NSLog(@"截取的值为：%@",string);

3.分隔字符串

NSString *string =@"sdfsfsfsAdfsdf";    NSArray *array = [string componentsSeparatedByString:@"A"]; //从字符A中分隔成2个元素的数组NSLog(@"array:%@",array); //后果是adfsfsfs和dfsdf//用一段字符串 替换一段字符串NSString *strUrl = [urlString stringByReplacingOccurrencesOfString:@“;" withString:@""];//替换某段字符NSString *idCard = [Str stringByReplacingCharactersInRange:NSMakeRange(5, 6) withString:@"*****************"];NSLog(@"idCard:%@",idCard); 

4.字母大小写转换

NSString  *str =@"AAaaBB3bb";// 把字符串全副转化为小写NSString *str1 = [str lowercaseString];NSString * str2 = str.lowercaseString;// 把字符串全副转化为大写(外面蕴含数字没事)str1 = [str uppercaseString];str2 = str.uppercaseString;//结尾大写，其余小写(外面蕴含数字,数字后的字母会大写)str1 =[str capitalizedString];str2 =str.capitalizedString;DLog(@"%@ - %@",str1, str2);