iOS根据字符串长度排序

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按内容从长到短

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NSArray* array = @[@"a",@"ab",@"abc",@"abcd",@"abcdefg",@"de",@"cdef",@"def",@"ab",@"abc",];
NSArray* array1 = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    NSUInteger len0 = [(NSString *)obj1 length];
    NSUInteger len1 = [(NSString *)obj2 length];
    return len0 > len1 ? NSOrderedAscending : NSOrderedDescending;
}];
NSLog(@" 原数组:%@\n新数组:%@", array, array1);

按内容从短到长

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NSArray* array2 = @[@"a",@"ab",@"abc",@"abcd",@"abcdefg",@"de",@"cdef",@"def",@"ab",@"abc",];
NSArray* array3 = [array2 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    NSUInteger len0 = [(NSString *)obj1 length];
    NSUInteger len1 = [(NSString *)obj2 length];
    return len0 < len1 ? NSOrderedAscending : NSOrderedDescending;
}];
NSLog(@" 原数组:%@\n新数组:%@", array2, array3);