iOS： 请问大家下面这段 ViewController 的代码（ app logic 的部分）怎么优化？我不想在 VC 里面放这些琐碎的代码怎么怎么搞？

我又出了一个版本，根据大家的意见整理了下

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//macro.h

#ifndef	weakify
#if __has_feature(objc_arc)
#define weakify( x )	autoreleasepool{} __weak __typeof__(x) __weak_##x##__ = x;
#else	// #if __has_feature(objc_arc)
#define weakify( x )	autoreleasepool{} __block __typeof__(x) __block_##x##__ = x;
#endif	// #if __has_feature(objc_arc)
#endif	// #ifndef	weakify

#ifndef	normalize
#if __has_feature(objc_arc)
#define normalize( x )	try{} @finally{} __typeof__(x) x = __weak_##x##__;
#else	// #if __has_feature(objc_arc)
#define normalize( x )	try{} @finally{} __typeof__(x) x = __block_##x##__;
#endif	// #if __has_feature(objc_arc)
#endif	// #ifndef	@normalize

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//store/pref/ASHPrefStore.h

@interface ASHPrefStore : NSObject

+ (BOOL)haveReadBroadcastTip;
+ (void)setHaveReadBroadcastTip;

@end

//store/pref/ASHPrefStore.m

@implementation ASHPrefStore

static NSString *const kHaveReadBroadcastTipKey = @"haveReadBroadcastTip";

+ (BOOL)haveReadBroadcastTip
{
    return [[NSUserDefaults standardUserDefaults] boolForKey:kHaveReadBroadcastTipKey];
}

+ (void)setHaveReadBroadcastTip
{
    [[NSUserDefaults standardUserDefaults] setObject:@(YES) forKey:kHaveReadBroadcastTipKey];
}

@end

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//network/ASHNetworkAPI.h

@interface ASHNetworkAPI : NSObject

+ (void)sendBroadcastRequestWithMsg:(NSString *)msg successBlock:(void(^)(void))successBlock failureBlock:(void(^)(NSError *error))failureBlock;

@end

//network/ASHNetworkAPI.m

@implementation ASHNetworkAPI

+ (void)sendBroadcastRequestWithMsg:(NSString *)msg successBlock:(void(^)(void))successBlock failureBlock:(void(^)(NSError *error))failureBlock
{
    //send request
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        !successBlock ?: successBlock();
    });
}

@end

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//utils/ui/ASHAlertUtils.h

@interface ASHAlertUtils : NSObject

+ (void)showAlertWithController:(UIViewController *)controller msg:(NSString *)msg callback:(void(^)(void))callback;

+ (void)showEditAlertWithController:(UIViewController *)controller title:(NSString *)title placeholder:(NSString *)placeholder callback:(void(^)(NSString *content))callback;

@end

//utils/ui/ASHAlertUtils.m

@implementation ASHAlertUtils

#pragma mark - utils

+ (void)showAlertWithController:(UIViewController *)controller msg:(NSString *)msg callback:(void(^)(void))callback
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:msg preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        !callback ?: callback();
    }]];
    [controller presentViewController:alert animated:YES completion:nil];
}

+ (void)showEditAlertWithController:(UIViewController *)controller title:(NSString *)title placeholder:(NSString *)placeholder callback:(void(^)(NSString *content))callback
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:nil preferredStyle:UIAlertControllerStyleAlert];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = placeholder;
    }];
    [alertController addAction:[UIAlertAction actionWithTitle:@"发送" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSString *content = [[alertController textFields][0] text];
        !callback ?: callback(content);
    }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"Canelled");
    }]];
    [controller presentViewController:alertController animated:YES completion:nil];
}

@end

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//controller/ASHTempViewController.m

@implementation ASHTempViewController

#pragma mark - app logic

- (void)sendBroadcastWithSuccessBlock:(void (^)(void))successBlock
{
    @weakify(self)
    void (^showSendBroadcast) (void) = ^{
        [ASHAlertUtils showEditAlertWithController:self title:@"发送广播'" placeholder:@"说点什么..." callback:^(NSString *content) {
            [ASHNetworkAPI sendBroadcastRequestWithMsg:content successBlock:successBlock failureBlock:^(NSError *error) {
                @normalize(self)
                !self ?: [ASHAlertUtils showAlertWithController:self msg:error.localizedDescription callback:nil];
            }];
        }];
    };
    
    if ([ASHPrefStore haveReadBroadcastTip]) {
        showSendBroadcast();
    } else {
        NSString *title = @"1、发布广播，全服玩家都可以看到；\n2、禁止发布反动、政治、色情、辱骂、广告等不良言论，否则将会遭到删除、封号处理。";
        [ASHAlertUtils showAlertWithController:self msg:title callback:^{
            [ASHPrefStore setHaveReadBroadcastTip];
            showSendBroadcast();
        }];
    }
}

@end