---

1、字符串切割
1、帶節點的字符串，如@"<p>憎惡的節點<br/></p>"我們只想要中央的中文

處置辦法：

NSString *string1 = @"<p>憎惡的節點<br/></p>";
 
/*此處將不想要的字符全體放進characterSet1中，不需別的加逗號或空格之類的，除非字符串中有你想要去除的空格，此處< p /等都是零丁存在，不作為全部字符*/
 
NSCharacterSet *characterSet1 = [NSCharacterSet characterSetWithCharactersInString:@"<p/brh>"];
 
// 將string1按characterSet1中的元素朋分成數組
 
NSArray *array1 = [string1 componentsSeparatedByCharactersInSet:characterSet1];
 
NSLog(@"array = %@",array1);
 
for(NSString *string1 in array1)
{
    if ([string1 length]>0) {
        
        // 此處string即為中文字符串
 
        NSLog(@"string = %@",string1);
    }
}

打印成果：

2016-01-17 10:55:34.017 string[17634:303] 
array = (
 "",
 "",
 "",
 "\U8ba8\U538c\U7684\U8282\U70b9",
 "",
 "",
 "",
 "",
 "",
 "",
 "",
 "",
 ""
)
2016-01-17 10:55:34.049 string[17634:303] 
string = 憎惡的節點

2、帶空格的字符串，如

@"hello world"去失落空格

NSString *string2 = @"hello world";
 
/*處置空格*/
 
NSCharacterSet *characterSet2 = [NSCharacterSet whitespaceCharacterSet];
 
// 將string1按characterSet1中的元素朋分成數組
NSArray *array2 = [string2 componentsSeparatedByCharactersInSet:characterSet2];
 
NSLog(@"\narray = %@",array2);
 
// 用來寄存處置後的字符串
NSMutableString *newString1 = [NSMutableString string];
 
for(NSString *string in array1)
{
    [newString1 appendString:string];
}
NSLog(@"newString = %@", newString1);

打印成果：

2016-01-17 11:02:49.656 string[17889:303] 
array = (
 hello,
 world
)
2016-01-17 11:02:49.657 string[17889:303] newString = helloworld

PS：處置字母等其他元素只需將NSCharacterSet的值轉變便可。

+ (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;

2、用字符將NSArray中的元素拼接起來

NSArray *array = [NSArray arrayWithObjects:@"hello",@"world",nil];
 
//如要用,:等字符串拼接，只需將上面的@" "空格換成@","或@":"便可
NSString *string = [array componentsJoinedByString:@" "];
 
NSLog(@"string = %@",string);

打印成果：

hello world

3、截取子串：

這裡以獲得時光為例，應用NSDate獲得到以後時光時，有時刻只須要日期或許只須要時光

1、從字符串開首截取到指定的地位，如

//獲得到以後日期時光   
NSDate *date = [NSDate date];
        
//界說日期格局,此處不重點評論辯論NSDate，故不具體解釋，在前面會具體評論辯論      
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
        
//設置日期格局       
[dateformatter setDateFormat:@"YYYY-MM-dd HH:mm"];
        
//將日期轉換成NSString類型     
NSString *string = [dateformatter stringFromDate:date];
NSLog(@"\ncurrent = %@",string);
               
//截取日期substringToIndex
NSString *currentDate = [string substringToIndex:10];
                
NSLog(@"\ncurrentDate = %@",currentDate);

打印成果：

current = 2016-01-1711:12


currentDate = 2016-01-17

2、抽取中央子串-substringWithRange

//截取月日
NSString *currentMonthAndDate = [string substringWithRange:[NSMakeRange(5, 5)]];
        
NSLog(@"currentMonthAndDate = %@",currentMonthAndDate);

打印成果：

currentMonthAndDate = 06-27

3、從某一名置開端截取- substringFromIndex

//截取時光substringFromIndex
NSString *currentTime = [string substringFromIndex:11];
        
NSLog(@"\ncurrentTime = %@",currentTime);\

打印成果：

currentTime = 11:25

4、比擬字符串

NSString *first = @"string";
NSString *second = @"String";

1、斷定兩個字符串能否雷同-isEqualToString辦法

BOOL isEqual = [first isEqualToString:second];
 
NSLog(@"first is Equal to second:%@",isEqual);

打印成果：

first is Equal to second:0

2、compare辦法比擬字符串三個值

NSOrderedSame//能否雷同
NSOrderedAscending//升序，按字母次序比擬，年夜於為真
NSOrderedDescending//降序，按字母次序比擬，小於為真

BOOL result = [first compare:sencond] == NSOrderedSame;   
NSLog(@"result:%d",result);

打印成果：

result:0 

BOOL result = [first compare:second] == NSOrderedAscending;   
NSLog(@"result:%d",result);

打印成果：

result:0

BOOL result = [first compare:second] == NSOrderedDecending; NSLog(@"result:%d",result);

打印成果：

result:1

3、不斟酌年夜小寫比擬字符串

BOOL result = [first compare:second
                     options:NSCaseInsensitiveSearch | NSNumericSearch] == NSOrderedSame;
NSLog(@"result:%d",result);

打印成果：

result:1

5、轉變字符串年夜小寫

NSString *aString = @"A String";
NSString *string = @"String";
//年夜寫
NSLog(@"aString:%@",[aString uppercaseString]);
//小寫
NSLog(@"string:%@",[string lowercaseString]);
//首字母年夜小寫
NSLog(@"string:%@",[string capitalizedString]);

打印成果：

aString:A STRING

string:string

string:String

6、在字符串中搜刮子串

NSString *string1 = @"This is a string";
NSString *string2 = @"string";
NSRange range = [string1 rangeOfString:string2];
NSUInteger location = range.location;
NSUInteger leight = range.length;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%li,Leight:%li",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];

打印成果：

astring:Location:10,Leight:6

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