Objectvie-C之 NSString 处理技巧<一>：分割字符串

来源：互联网发布：知乎童谣诈骗事件始末编辑：程序博客网时间：2024/06/10 14:49

一、带节点的字符串，如@"<p>讨厌的节点<br/></p>"我们只想要中间的中文

处理方法一：

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NSString *string1 = @"<p>讨厌的节点<br/></p>";
 
/*此处将不想要的字符全部放进characterSet1中，不需另外加逗号或空格之类的，除非字符串中有你想要去除的空格，此处< p /等都是单独存在，不作为整个字符*/
 
NSCharacterSet *characterSet1 = [NSCharacterSet characterSetWithCharactersInString:@"<p/brh>"];
 
// 将string1按characterSet1中的元素分割成数组
 
NSArray *array1 = [string1 componentsSeparatedByCharactersInSet:characterSet1];
 
NSLog(@"array = %@",array1);
 
for(NSString *string1 in array1)
{
    if([string1 length]>0) {
         
        // 此处string即为中文字符串
 
        NSLog(@"string = %@",string1);
    }
}

打印结果： 2013-05-31 10:55:34.017 string[17634:303]

array = (
"",
"",
"",
"\U8ba8\U538c\U7684\U8282\U70b9",
"",
"",
"",
"",
"",
"",
"",
"",
""
)
2013-05-31 10:55:34.049 string[17634:303]
string = 讨厌的节点

二、带空格的字符串，如

@"hello world"去掉空格

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NSString *string2 = @"hello world";
 
/*处理空格*/
 
NSCharacterSet *characterSet2 = [NSCharacterSet whitespaceCharacterSet];
 
// 将string1按characterSet1中的元素分割成数组
NSArray *array2 = [string2 componentsSeparatedByCharactersInSet:characterSet2];
 
NSLog(@"\narray = %@",array2);
 
// 用来存放处理后的字符串
NSMutableString *newString1 = [NSMutableString string];
 
for(NSString *string in array1)
{
    [newString1 appendString:string];
}
NSLog(@"newString = %@", newString1);

打印结果：

2013-05-31 11:02:49.656 string[17889:303]
array = (
hello,
world
)
2013-05-31 11:02:49.657 string[17889:303] newString = helloworld

PS：处理字母等其他元素只需将NSCharacterSet的值改变即可。

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+ (id)controlCharacterSet;
 
+ (id)whitespaceCharacterSet;
 
+ (id)whitespaceAndNewlineCharacterSet;
 
+ (id)decimalDigitCharacterSet;
 
+ (id)letterCharacterSet;
 
+ (id)lowercaseLetterCharacterSet;
 
+ (id)uppercaseLetterCharacterSet;
 
+ (id)nonBaseCharacterSet;
 
+ (id)alphanumericCharacterSet;
 
+ (id)decomposableCharacterSet;
 
+ (id)illegalCharacterSet;
 
+ (id)punctuationCharacterSet;
 
+ (id)capitalizedLetterCharacterSet;
 
+ (id)symbolCharacterSet;
 
+ (id)newlineCharacterSet NS_AVAILABLE(10_5, 2_0);
 
+ (id)characterSetWithRange:(NSRange)aRange;
 
+ (id)characterSetWithCharactersInString:(NSString *)aString;
 
+ (id)characterSetWithBitmapRepresentation:(NSData *)data;
 
+ (id)characterSetWithContentsOfFile:(NSString *)fName;

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