在Objective-C中使用NSString的大写或更改大小写 [英] Capitalize or change case of an NSString in Objective-C

问题描述

我想知道如何将 NSMutableArray 中的对象中的字符串大写。

I was wondering how to capitalize a string found in an object in an NSMutableArray.

c $ c> NSArray 包含索引2处的字符串'April'。

我希望将其更改为'APRIL'。

An NSArray contains the string 'April' at index 2.
I want this to be changed to 'APRIL'.

有这样简单吗？

viewNoteDateMonth.text  = [[displayDate objectAtIndex:2] capitalized];

推荐答案

这里ya go：

viewNoteDateMonth.text  = [[displayDate objectAtIndex:2] uppercaseString];

Btw：

april是小写➔[NSString lowercaseString]

APRIL UPPERCASE ➔ [NSString uppercaseString]

四月五月 大写/ Word Caps ➔[NSString capitalizedString]

四月可能 句子上限➔（缺少方法;请参阅下面的解决方法）

Btw:
"april" is lowercase ➔ [NSString lowercaseString]
"APRIL" is UPPERCASE ➔ [NSString uppercaseString]
"April May" is Capitalized/Word Caps ➔ [NSString capitalizedString]
"April may" is Sentence caps ➔ (method missing; see workaround below)

want被称为大写，而不是大写。 ;）

Hence what you want is called "uppercase", not "capitalized". ;)

至于Sentence Caps，我们必须记住，通常Sentence是指整个字符串。如果你希望真正的句子使用第二个方法，下面，否则第一个：

As for "Sentence Caps" one has to keep in mind that usually "Sentence" means "entire string". If you wish for real sentences use the second method, below, otherwise the first:

@interface NSString ()

- (NSString *)sentenceCapitalizedString; // sentence == entire string
- (NSString *)realSentenceCapitalizedString; // sentence == real sentences

@end

@implementation NSString

- (NSString *)sentenceCapitalizedString {
    if (![self length]) {
        return [NSString string];
    }
    NSString *uppercase = [[self substringToIndex:1] uppercaseString];
    NSString *lowercase = [[self substringFromIndex:1] lowercaseString];
    return [uppercase stringByAppendingString:lowercase];
}

- (NSString *)realSentenceCapitalizedString {
    __block NSMutableString *mutableSelf = [NSMutableString stringWithString:self];
    [self enumerateSubstringsInRange:NSMakeRange(0, [self length])
                             options:NSStringEnumerationBySentences
                          usingBlock:^(NSString *sentence, NSRange sentenceRange, NSRange enclosingRange, BOOL *stop) {
        [mutableSelf replaceCharactersInRange:sentenceRange withString:[sentence sentenceCapitalizedString]];
    }];
    return [NSString stringWithString:mutableSelf]; // or just return mutableSelf.
}

@end

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