打乱NSArray并使用打乱的数组来更改切换大小写。目标C

#import <Foundation/Foundation.h>

NSArray *originalArray = @[@"apple", @"banana", @"orange", @"grape", @"watermelon"];

@interface NSMutableArray (Shuffling)
- (void)shuffle;
@end

@implementation NSMutableArray (Shuffling)
- (void)shuffle {
    NSUInteger count = [self count];
    for (NSUInteger i = 0; i < count; ++i) {
        NSInteger remainingCount = count - i;
        NSInteger exchangeIndex = i + arc4random_uniform((u_int32_t)remainingCount);
        [self exchangeObjectAtIndex:i withObjectAtIndex:exchangeIndex];
    }
}
@end

NSMutableArray *shuffledArray = [originalArray mutableCopy];
[shuffledArray shuffle];

for (NSString *string in shuffledArray) {
    NSString *modifiedString = [string uppercaseString]; // 或者使用lowercaseString方法来转换为小写
    NSLog(@"%@", modifiedString);
}