如何在 iOS 上将字符串拆分为子字符串？
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How to split string into substrings on iOS?
提问by Chilly Zhong
I received an NSStringfrom the server. Now I want to split it into the substring which I need.
How to split the string?
我NSString从服务器收到了一个。现在我想把它拆分成我需要的子串。如何拆分字符串？
For example:
例如：
substring1:read from the second character to 5th character
substring1：从第二个字符读取到第5个字符
substring2:read 10 characters from the 6th character.
substring2：从第 6 个字符开始读取 10 个字符。
回答by codelogic
You can also split a string by a substring, using NString's componentsSeparatedByStringmethod.
您还可以使用 NString 的componentsSeparatedByString方法按子字符串拆分字符串。
Example from documentation:
文档中的示例：
NSString *list = @"Norman, Stanley, Fletcher";
NSArray *listItems = [list componentsSeparatedByString:@", "];
回答by Joel Levin
NSString has a few methods for this:
NSString 为此提供了一些方法：
[myString substringToIndex:index];
[myString substringFromIndex:index];
[myString substringWithRange:range];
Check the documentation for NSString for more information.
查看 NSString 的文档以获取更多信息。
回答by ben
I wrote a little method to split strings in a specified amount of parts. Note that it only supports single separator characters. But I think it is an efficient way to split a NSString.
我写了一个小方法来将字符串分成指定数量的部分。请注意，它仅支持单分隔符。但我认为这是拆分 NSString 的有效方法。
//split string into given number of parts
-(NSArray*)splitString:(NSString*)string withDelimiter:(NSString*)delimiter inParts:(int)parts{
NSMutableArray* array = [NSMutableArray array];
NSUInteger len = [string length];
unichar buffer[len+1];
//put separator in buffer
unichar separator[1];
[delimiter getCharacters:separator range:NSMakeRange(0, 1)];
[string getCharacters:buffer range:NSMakeRange(0, len)];
int startPosition = 0;
int length = 0;
for(int i = 0; i < len; i++) {
//if array is parts-1 and the character was found add it to array
if (buffer[i]==separator[0] && array.count < parts-1) {
if (length>0) {
[array addObject:[string substringWithRange:NSMakeRange(startPosition, length)]];
}
startPosition += length+1;
length = 0;
if (array.count >= parts-1) {
break;
}
}else{
length++;
}
}
//add the last part of the string to the array
[array addObject:[string substringFromIndex:startPosition]];
return array;
}
