ios - 在 iOS 中获取字符串中空格后的字符

Question

我有一个这样的字符串:@"The Happy Day" 并且我只想将 "THD" 保存在另一个字符串中。我该怎么做？

Answer 1

我会这样做...

NSString *string = @"The  Happy Day";

// Create array of words in string...
NSArray *words = [string componentsSeparatedByString:@" "];

// Create array to hold first letter of each word...
NSMutableArray *firstLetters = [NSMutableArray arrayWithCapacity:[words count]];

// Iterate through words and add first letter of each word to firstLetters array...
for (NSString *word in words) {
    if ([word length] == 0) continue;
    [firstLetters addObject:[word substringToIndex:1]];
}

// Join the first letter error into a single string...
NSString *acronym = [firstLetters componentsJoinedByString:@""];

使用 Swift 中的函数类型(例如 map)可以做得更好，但是没有像 Objective-C 中那样的任何内置方法。