字符串對象NSString
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Objective-C使用NSString類描述字符串
NSString是一種不可變對象,即:對象創(chuàng)建后,值不可改變
NSString提供大量的操作方法:
多樣的創(chuàng)建方式
與數(shù)值的轉(zhuǎn)換
文件/URL操作
子串的獲取
構(gòu)建新串
描述路徑的各種操作
...
字符串對象NSString及基本操作
創(chuàng)建:init方法和類方法
+ (instancetype)string //空串 + (instancetype)stringWithFormat:(NSString *)format, … //格式化字符串 + (instancetype)stringWithUTF8String:(const char *)bytes //通過C字符串構(gòu)造
字面值:
NSString *s = @"hello”; //常量方式
基本操作
@property(readonly) const char *UTF8String //c字符串 @property(readonly) NSUInteger length //字符串長度 - (unichar)characterAtIndex:(NSUInteger)index //獲得字符 - (BOOL)isEqualToString:(NSString *)aString //判斷字符串是否相等
轉(zhuǎn)換成數(shù)值
@property(readonly) double doubleValue @property(readonly) float floatValue @property(readonly) int intValue @property(readonly) NSInteger integerValue @property(readonly) long long longLongValue @property(readonly) BOOL boolValue
文件及URL操作相關(guān)
+ (instancetype)stringWithContentsOfFile:(NSString *)path encoding:(NSStringEncoding)enc error:(NSError * _Nullable *)error - (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile
+ (instancetype)stringWithContentsOfURL:(NSURL *)url encoding:(NSStringEncoding)enc error:(NSError * _Nullable *)error - (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)atomically
獲得子串及構(gòu)建新串
- (NSString *)substringFromIndex:(NSUInteger)anIndex - (NSString *)substringWithRange:(NSRange)aRange - (NSString *)substringToIndex:(NSUInteger)anIndex - (NSRange)rangeOfString:(NSString *)aString - (BOOL)hasPrefix:(NSString *)aString - (BOOL)hasSuffix:(NSString *)aString - (NSArray<NSString *> *)componentsSeparatedByString:(NSString *)separator
@property(readonly, copy) NSString *lowercaseString @property(readonly, copy) NSString *uppercaseString - (NSString *)stringByAppendingFormat:(NSString *)format, ... - (NSString *)stringByAppendingString:(NSString *)aString
字符串用于表示路徑
@property(readonly, copy) NSString *lastPathComponent @property(readonly, copy) NSString *pathExtension @property(readonly, copy) NSString *stringByDeletingLastPathComponent @property(readonly, copy) NSString *stringByDeletingPathExtension - (NSString *)stringByAppendingPathComponent:(NSString *)aString - (NSString *)stringByAppendingPathExtension:(NSString *)ext
可變字符串對象
NSMutableString用于描述可變字符串,是NSString的子類
追加:
- (void)appendString:(NSString *)aString - (void)appendFormat:(NSString *)format, ...
刪除:
- (void) deleteCharactersInRange:(NSRange) aRange
插入/替換:
- (void)insertString:(NSString *)aString atIndex:(NSUInteger)anIndex - (void)replaceCharactersInRange:(NSRange)aRange withString:(NSString *)aString - (void)setString:(NSString *)aString
網(wǎng)頁題目:Foundation框架(2)字符串對象
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