1 //
2 // RootViewController.m
3 // SimpleWeather
4 //
5 // Created by TBXark on 15-4-17.
6 // Copyright (c) 2015年 Ryan Nystrom. All rights reserved.
7 //
8
9 #import "RootViewController.h"
10 #import <ReactiveCocoa.h>
11 #import <TSMessage.h>
12 #import "ViewModel.h"
13
14 @interface RootViewController ()<UIGestureRecognizerDelegate>
15
16 @property (nonatomic,strong) UITextField *textfield;
17 @property (nonatomic,strong) RACSubject *gestureRecognizerIsRunningSubject;
18 @property (nonatomic,strong) RACSubject *gestureRecognizerValueSubject;
19 @property (nonatomic,strong) UIView *someView;
20
21 @property (nonatomic,strong) ViewModel *viewModel;
22 @property(assign) NSUInteger scoreUpdates;
23
24
25 @end
26
27 static NSUInteger const kMaxUploads = 5;
28
29
30 @implementation RootViewController
31
32 - (void)viewDidLoad {
33 [super viewDidLoad];
34
35
36 // 模式
37 //
38 // 在ReactiveCocoa中有三种基本的模式：责任链、分割和组合模式（chaining, splitting, and combining）在ReactiveCocoa中的核心是signal:（信号），它表示不断变化的状态。当我们使用chain、split和combine时，实际上我们就是在操作这些signal
39
40 //*************************************************************************//
41
42 // 责任链:chaining
43 // Chaining是在ReactiveCocoa最常用的模式：将一个已有的signal转换为一个新的signal。常用的操作是创建一个新的signal，再对它使用filter:、map:或startWith:等方法。
44
45 CGFloat width = self.view.bounds.size.width;
46 _textfield = [[UITextField alloc] initWithFrame:CGRectMake(40,30, width-80, 30)];
47 _textfield.textAlignment = NSTextAlignmentCenter;
48 // [self.view addSubview:_textfield];
49
50 RAC(self,textfield.text) = [[[RACSignal interval:1 onScheduler:[RACScheduler mainThreadScheduler]] startWith:[NSDate date]] map:^id(NSDate *value) {
51 NSDateFormatter *df = [[NSDateFormatter alloc] init];
52 df.dateFormat = @"yyyy-MM-dd hh:mm:ss";
53 return [df stringFromDate:value];
54 }];
55
56 //*************************************************************************//
57
58 // 分割:Splitting
59 // Splitting与chaining比较类似，也是将signal转换为其它的sginal，不同之处在于，Splitting会重复使用中间的signals。Splitting看起来要复杂些，其实也就是一个signals使用多次罢了。
60
61 UITextField *dateTextField = [[UITextField alloc] initWithFrame:CGRectMake(40, 70, width-80, 30)];
62 UITextField *timeTextField = [[UITextField alloc] initWithFrame:CGRectMake(40, 100, width-80, 30)];
63 // [self.view addSubview:dateTextField];
64 // [self.view addSubview:timeTextField];
65 dateTextField.textAlignment = NSTextAlignmentCenter;
66 timeTextField.textAlignment = NSTextAlignmentCenter;
67
68
69 RACSignal *mainSingal = [[[RACSignal interval:1 onScheduler:[RACScheduler mainThreadScheduler]] startWith:[NSDate date]] map:^id(NSDate *value) {
70 NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:value];
71 return dateComponents;
72 }];
73
74 // deliverOn:[RACScheduler mainThreadScheduler]];
75 RAC(dateTextField,text) = [[mainSingal map:^id(NSDateComponents *value) {
76 return [NSString stringWithFormat:@"%u-%u-%u",value.year,value.month,value.day];
77 }] deliverOn:[RACScheduler mainThreadScheduler]];
78 RAC(timeTextField,text) = [[mainSingal map:^id(NSDateComponents *value) {
79 return [NSString stringWithFormat:@"%u:%u:%u",value.hour,value.minute,value.second];
80 }] deliverOn:[RACScheduler mainThreadScheduler]];
81
82 //*************************************************************************//
83
84 // 组合:combining
85 // combining就是将几个signal结合起来创建出一个新的signal。
86 // 组合的信号(combined signal)只会在所有的输入至少都有一个值的时候才会发送它的第一个值
87 UITextField *userName = [[UITextField alloc] initWithFrame:CGRectMake(40, 130, width-80, 30)];
88 UITextField *password = [[UITextField alloc] initWithFrame:CGRectMake(40, 165, width-80, 30)];
89 UIButton *loginButton = [[UIButton alloc] initWithFrame:CGRectMake(40, 200, width-80, 30)];
90 userName.backgroundColor = [UIColor grayColor];
91 password.backgroundColor = [UIColor grayColor];
92 loginButton.backgroundColor = [UIColor darkGrayColor];
93 [loginButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
94 [loginButton setTitle:@"Login" forState:UIControlStateNormal];
95 [loginButton setTitle:@"Waiting" forState:UIControlStateDisabled];
96 // [self.view addSubview:userName];
97 // [self.view addSubview:password];
98 // [self.view addSubview:loginButton];
99
100 // 在这里，我们将“登录”按钮的enable状态绑定到使用combineLatest:reduce:方法创建的signal上。
101 // 这个方法的第二个参数是一个block，这个block的参数是combineLatest中的参数的最新值的组合。我们将两个文本框的text signal一起传到combineLatest，在reduce的block中，该block也就会接收到两个NSString的参数.
102 // 这个block的工作就是将两个参数值组合起来生成一个值，然后返回。
103 RAC(loginButton,enabled) = [RACSignal combineLatest:@[userName.rac_textSignal,password.rac_textSignal] reduce:^id(NSString *userName, NSString *password) {
104 return @(userName.length >= 6 && password.length >= 6);
105 }];
106
107 //*************************************************************************//
108
109 //RACSubjects
110 //
111 // RACSubjects则充当了非reactive和 reactive代码的桥梁。
112 // RACSubject是能够手动发送新值的signal。
113 // 虽然RACSubjects是非reactive代码与ReactiveCocoa代码的桥梁，但过分滥用也是有风险的。当我们能够通过chaining signals完成任务的话，就不要依赖于RACSubjects的值。
114 // 虽然subscriptions很有用，执行副作用也是必要的，但要小心过度使用。它们就是可变的变量、状态，这些正是ReactiveCocoa所避免的。在能够通过绑定属性映射signals完成任务的时候，就不要使用RACSubjects。
115
116 self.gestureRecognizerIsRunningSubject = [RACSubject subject];
117 self.gestureRecognizerValueSubject = [RACSubject subject];
118 self.someView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 40)];
119 self.someView.layer.cornerRadius = 20;
120 self.someView.backgroundColor = [UIColor darkGrayColor];
121
122 UIPanGestureRecognizer *tap = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(gestureRecognizerReceivedTouch:)];
123 tap.delegate = self;
124 RAC(self,someView.frame) = [self.gestureRecognizerValueSubject map:^id(NSValue *value) {
125 CGPoint location = [value CGPointValue];
126 CGFloat size = 40.0f;
127 return [NSValue valueWithCGRect:CGRectMake(location.x - size/2.0f, location.y - size/2.0f, size, size)];
128 }];
129
130 // [self.view addSubview:self.someView];
131 // [self.view addGestureRecognizer:tap];
132
133
134 //*************************************************************************//
135
136 //RACCommand
137 //
138 // RACCommand类用于表示事件的执行，一般来说是在UI上的某些动作来触发这些事件，比如点击一个按钮。RACCommand的实例能够决定是否可以被执行，这个特性能反应在UI上，而且它能确保在其不可用时不会被执行。通常，当一个命令可以执行时，会将它的属性allowsConcurrentExecution设置为它的默认值：NO，从而确保在这个命令已经正在执行的时候，不会同时再执行新的操作。命令执行的返回值是一个RACSignal，因此我们能对该返回值进行next:，completed或error:
139
140
141 // RAC给UITableViewCell提供了一个方法：rac_prepareForReuseSignal，它的作用是当Cell即将要被重用时，告诉Cell。想象Cell上有多个button，Cell在初始化时给每个button都addTarget:action:forControlEvents，被重用时需要先移除这些target，下面这段代码就可以很方便地解决这个问题：
142 // [[[self.cancelButton
143 // rac_signalForControlEvents:UIControlEventTouchUpInside]
144 // takeUntil:self.rac_prepareForReuseSignal]
145 // subscribeNext:^(UIButton *x) {
146 // // do other things
147 // }];
148
149
150
151 //*************************************************************************//
152
153 //概念
154
155 //Streams 抽象基类
156 // -Signals 信号
157 // -Sequences 信号集合
158
159 //RACCommand 命令?
160 //Schedulers 多线程?
161
162 //Subscription 订阅 接收 -subscribeNext: -subscribeError: -subscribeCompleted:
163 //Injecting effects 注入效果 -doNext: -doError: -doCompleted:
164 //Mapping 信号转换
165 //Filtering 信号过滤
166 //Concatenating 信号拼接
167 //Flattening 数组拼接
168 //Mapping and flattening 先Map在Flatten
169
170 [self reactiveCocoaBasicOperation];
171 [self reactiveCocoaMVVM];
172
173 }
174
175 - (void)reactiveCocoaMVVM
176 {
177 CGFloat width = self.view.bounds.size.width;
178 UITextField *nameField = [[UITextField alloc] initWithFrame:CGRectMake(40, 40, width-80, 40)];
179 [self.view addSubview:nameField];
180
181 UILabel *scoreField = [[UILabel alloc] initWithFrame:CGRectMake(40, 100, width-80, 40)];
182 [self.view addSubview:scoreField];
183
184 UIStepper *scoreStepper = [[UIStepper alloc] initWithFrame:CGRectMake(100, 160, width-200, 40)];
185 [self.view addSubview:scoreStepper];
186
187 UIButton *uploadButton = [[UIButton alloc] initWithFrame:CGRectMake(100, 210, width-200, 40)];
188 [self.view addSubview:uploadButton];
189 [uploadButton setTitle:@"Upload" forState:UIControlStateNormal];
190 uploadButton.backgroundColor = [UIColor darkGrayColor];
191
192
193
194 self.viewModel = [ViewModel new];
195
196 //using with @strongify(self) this makes sure that self isn‘t retained in the blocks
197 //this is declared in RACEXTScope.h
198 @weakify(self);
199
200 //Start Binding our properties
201 RAC(nameField,text) = [RACObserve(self.viewModel, playerName) distinctUntilChanged];
202
203 [[nameField.rac_textSignal distinctUntilChanged] subscribeNext:^(NSString *x) {
204 //this creates a reference to self that when used with @weakify(self);
205 //makes sure self isn‘t retained
206 @strongify(self);
207 self.viewModel.playerName = x;
208 }];
209
210 //the score property is a double, RC gives us updates as NSNumber which we just call
211 //stringValue on and bind that to the scorefield text
212 RAC(scoreField,text) = [RACObserve(self.viewModel,points) map:^id(NSNumber *value) {
213 return [value stringValue];
214 }];
215
216 //Setup bind the steppers values
217 scoreStepper.value = self.viewModel.points;
218 RAC(scoreStepper,stepValue) = RACObserve(self.viewModel,stepAmount);
219 RAC(scoreStepper,maximumValue) = RACObserve(self.viewModel,maxPoints);
220 RAC(scoreStepper,minimumValue) = RACObserve(self.viewModel,minPoints);
221 //bind the hidden field to a signal keeping track if
222 //we‘ve updated less than a certain number times as the view model specifies
223 RAC(scoreStepper,hidden) = [RACObserve(self,scoreUpdates) map:^id(NSNumber *x) {
224 @strongify(self);
225 return @(x.intValue >= self.viewModel.maxPointUpdates);
226 }];
227
228 //only take the maxPointUpdates number of score updates
229 //skip 1 because we don‘t want the 1st value provided, only changes
230 [[[RACObserve(scoreStepper,value) skip:1] take:self.viewModel.maxPointUpdates] subscribeNext:^(id newPoints) {
231 @strongify(self);
232 self.viewModel.points = [newPoints doubleValue];
233 self.scoreUpdates++;
234 }];
235
236 //this signal should only trigger if we have "bad words" in our name
237 [self.viewModel.forbiddenNameSignal subscribeNext:^(NSString *name) {
238 @strongify(self);
239 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Forbidden Name!"
240 message:[NSString stringWithFormat:@"The name %@ has been forbidden!",name]
241 delegate:nil
242 cancelButtonTitle:@"Ok"
243 otherButtonTitles:nil];
244 [alert show];
245 self.viewModel.playerName = @"";
246 }];
247
248 //let the upload(save) button only be enabled when the view model says its valid
249 RAC(uploadButton,enabled) = self.viewModel.modelIsValidSignal;
250
251 //set the control action for our button to be the ViewModels action method
252 [uploadButton addTarget:self.viewModel
253 action:@selector(uploadData:)
254 forControlEvents:UIControlEventTouchUpInside];
255
256 //we can subscribe to the same thing in multiple locations
257 //here we skip the first 4 signals and take only 1 update
258 //and then disable/hide certain UI elements as our app
259 //only allows 5 updates
260 [[[[uploadButton rac_signalForControlEvents:UIControlEventTouchUpInside]
261 skip:(kMaxUploads - 1)] take:1] subscribeNext:^(id x) {
262 @strongify(self);
263 nameField.enabled = NO;
264 scoreStepper.hidden = YES;
265 uploadButton.hidden = YES;
266 }];
267
268 }
269
270 - (void)reactiveCocoaBasicOperation
271 {
272 //基础操作
273
274
275 // 1.响应与信号
276
277 //##Subscription 订阅
278 // -subscribe…
279 // The -subscribe… methods give you access to the current and future values in a signal:
280 #if 0
281 RACSignal *letters = [@"A B C D E F G H I" componentsSeparatedByString:@" "].rac_sequence.signal;
282 [letters subscribeNext:^(NSString *x) {
283 NSLog(@"%@", x);
284 }];
285 #endif
286
287 #if 0
288 // For a cold signal, side effects will be performed once per subscription:
289 __block unsigned subscriptions = 0;
290
291 RACSignal *loggingSignal = [RACSignal createSignal:^ RACDisposable * (id<RACSubscriber> subscriber) {
292 subscriptions++;
293 NSLog(@"I am here");
294 [subscriber sendCompleted];
295 return nil;
296 }];
297 // Outputs:
298 // subscription 1
299 [loggingSignal subscribeCompleted:^{
300 NSLog(@"subscription %u", subscriptions);
301 }];
302
303 // Outputs:
304 // subscription 2
305 [loggingSignal subscribeCompleted:^{
306 NSLog(@"subscription %u", subscriptions);
307 }];
308 #endif
309
310
311 //##Injecting effects 注入
312 // -doNext -doCompleted -doError
313 // The -do… methods add side effects to a signal without actually subscribing to it:
314 // 添加事件,并不需要信号真正被订阅
315 #if 0
316
317 __block unsigned subscriptions = 0;
318
319 RACSignal *loggingSignal = [RACSignal createSignal:^ RACDisposable * (id<RACSubscriber> subscriber) {
320 subscriptions++;
321 [subscriber sendCompleted];
322 // [subscriber sendNext:nil];
323 return nil;
324 }];
325
326 // Does not output anything yet
327 loggingSignal = [loggingSignal doCompleted:^{
328 NSLog(@"about to complete subscription %u", subscriptions);
329 }];
330
331 loggingSignal = [loggingSignal doNext:^(id x) {
332 NSLog(@"about to next subscription %u", subscriptions);
333 }];
334
335 [loggingSignal subscribeNext:^(id x) {
336 NSLog(@"subscription %u",subscriptions);
337 }];
338 // Outputs:
339 // about to complete subscription 1
340 // subscription 1
341 [loggingSignal subscribeCompleted:^{
342 NSLog(@"subscription %u", subscriptions);
343 }];
344 #endif
345
346 // 2.信号流变换 These operators transform a single stream into a new stream.
347
348 //## Mapping 映射
349 // The -map: method is used to transform the values in a stream, and create a new stream with the results:
350 // 将流的值转换为新的值后再次放入流中
351 #if 0
352 RACSequence *letters = [@"A B C D E F G H I" componentsSeparatedByString:@" "].rac_sequence;
353
354 // Contains: AA BB CC DD EE FF GG HH II
355 RACSequence *mapped = [letters map:^(NSString *value) {
356 return [value stringByAppendingString:value];
357 }];
358
359 [mapped.signal subscribeNext:^(NSString *str) {
360 NSLog(@"%@",str);
361 }];
362 #endif
363
364
365 //##Filtering 过滤
366 // -filter:
367 // 使用blcok过滤流,使得能通过测试的流通过
368 #if 0
369 RACSequence *numbers = [@"1 2 3 4 5 6 7 8 9" componentsSeparatedByString:@" "].rac_sequence;
370
371 // Contains: 2 4 6 8
372 RACSequence *filtered = [numbers filter:^ BOOL (NSString *value) {
373 return (value.intValue % 2) == 0;
374 }];
375 [filtered.signal subscribeNext:^(id x) {
376 NSLog(@"%@",x);
377 }];
378 #endif
379
380
381 // 3.流的组合 These operators combine multiple streams into a single new stream
382
383 //##Concatenating 连接
384 // -concat:
385 // 将一个信号添加到另一个信号后面
386 #if 0
387 RACSequence *letters = [@"A B C D E F G H I" componentsSeparatedByString:@" "].rac_sequence;
388 RACSequence *numbers = [@"1 2 3 4 5 6 7 8 9" componentsSeparatedByString:@" "].rac_sequence;
389
390 // Contains: A B C D E F G H I 1 2 3 4 5 6 7 8 9
391 RACSequence *concatenated = [letters concat:numbers];
392 [concatenated.signal subscribeNext:^(id x) {
393 NSLog(@"%@",x);
394
395 }];
396
397 #endif
398
399 //##Flattening 压扁
400 // -flatten
401 // Flattn操作应用在"流中的流",将其组合并形成一个新的流
402
403 #if 0
404
405 RACSubject *letters = [RACSubject subject];
406 RACSubject *numbers = [RACSubject subject];
407 RACSignal *signalOfSignals = [RACSignal createSignal:^ RACDisposable * (id<RACSubscriber> subscriber) {
408 // 其中letters为信号,letters中的值为信号中的信号,如果不进行压扁,者不能获得真正的信号
409 [subscriber sendNext:letters];
410 [subscriber sendNext:numbers];
411 [subscriber sendCompleted];
412 return nil;
413 }];
414
415 RACSignal *flattened = [signalOfSignals flatten];
416
417 // Outputs: A 1 B C 2
418 [flattened subscribeNext:^(NSString *x) {
419 NSLog(@"%@", x);
420 }];
421
422 //Outputs : <RACSubject: 0x7a1f9ff0> name:
423 // <RACSubject: 0x7a17fdd0> name:
424
425 [signalOfSignals subscribeNext:^(id x) {
426 NSLog(@"%@",x);
427 }];
428
429 [letters sendNext:@"A"];
430 [numbers sendNext:@"1"];
431 [letters sendNext:@"B"];
432 [letters sendNext:@"C"];
433 [numbers sendNext:@"2"];
434
435 #endif
436
437
438 //##Mapping and flattening
439 // -flattenMap:
440 // it‘s -map: followed by -flatten.
441
442 #if 0
443 RACSequence *numbers = [@"1 2 3 4 5 6 7 8 9" componentsSeparatedByString:@" "].rac_sequence;
444
445 // Contains: 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9
446 RACSequence *extended = [numbers flattenMap:^(NSString *num) {
447 return @[ num, num ].rac_sequence;
448 }];
449
450 // Contains: 1_ 3_ 5_ 7_ 9_
451 RACSequence *edited = [numbers flattenMap:^(NSString *num) {
452 if (num.intValue % 2 == 0) {
453 return [RACSequence empty];
454 } else {
455 NSString *newNum = [num stringByAppendingString:@"_"];
456 return [RACSequence return:newNum];
457 }
458 }];
459 // [extended.signal subscribeNext:^(id x) {
460 // NSLog(@"%@",x);
461 // }];
462
463 [edited.signal subscribeNext:^(id x) {
464 NSLog(@"%@",x);
465 }];
466
467 #endif
468
469 // 4.信号的组合 These operators combine multiple signals into a single new RACSignal.
470
471 //##Sequencing
472 // -then:
473 // starts the original signal, waits for it to complete, and then only forwards the values from a new signal:
474 #if 0
475 RACSignal *letters = [@"A B C D E F G H I" componentsSeparatedByString:@" "].rac_sequence.signal;
476 // The new signal only contains: 1 2 3 4 5 6 7 8 9
477 // But when subscribed to, it also outputs: A B C D E F G H I
478 RACSignal *sequenced = [[letters
479 doNext:^(NSString *letter) {
480 NSLog(@"%@", letter);
481 }]
482 then:^{
483 return [@"1 2 3 4 5 6 7 8 9" componentsSeparatedByString:@" "].rac_sequence.signal;
484 }];
485
486 [sequenced subscribeNext:^(id x) {
487 NSLog(@"%@",x);
488 }];
489 #endif
490
491 //##Merging 合并
492 // +merge:
493 // 将多个信号转发到一个信号流,一旦信号到达立即转发
494 #if 0
495
496 RACSubject *letters = [RACSubject subject];
497 RACSubject *numbers = [RACSubject subject];
498 RACSignal *merged = [RACSignal merge:@[ letters, numbers ]];
499
500 // Outputs: A 1 B C 2
501 [merged subscribeNext:^(NSString *x) {
502 NSLog(@"%@", x);
503 }];
504
505 [letters sendNext:@"A"];
506 [numbers sendNext:@"1"];
507 [letters sendNext:@"B"];
508 [letters sendNext:@"C"];
509 [numbers sendNext:@"2"];
510
511 #endif
512
513
514 //##Combining latest values
515 //+combineLatest:
516 // 方法将观察多个信号的变化,然后发送最新的值发生改变时
517 // 每个信号至少有一个值时才会转发,而merge是立即转发
518 #if 0
519 RACSubject *letters = [RACSubject subject];
520 RACSubject *numbers = [RACSubject subject];
521 RACSignal *combined = [RACSignal
522 combineLatest:@[ letters, numbers ]
523 reduce:^(NSString *letter, NSString *number) {
524 return [letter stringByAppendingString:number];
525 }];
526
527 // Outputs: B1 B2 C2 C3
528 [combined subscribeNext:^(id x) {
529 NSLog(@"%@", x);
530 }];
531
532 [letters sendNext:@"A"];
533 [letters sendNext:@"B"];
534 [numbers sendNext:@"1"];
535 [numbers sendNext:@"2"];
536 [letters sendNext:@"C"];
537 [numbers sendNext:@"3"];
538
539 #endif
540
541 //##Switching
542 // -switchToLatest
543 // 作用与信号中的信号,并且转发最后的值
544 #if 0
545 RACSubject *letters = [RACSubject subject];
546 RACSubject *numbers = [RACSubject subject];
547 RACSubject *signalOfSignals = [RACSubject subject];
548
549 RACSignal *switched = [signalOfSignals switchToLatest];
550
551 // Outputs: A B 1 D
552 [switched subscribeNext:^(NSString *x) {
553 NSLog(@"%@", x);
554 }];
555
556 [signalOfSignals sendNext:letters];
557 [letters sendNext:@"A"];
558 [letters sendNext:@"B"];
559
560 [signalOfSignals sendNext:numbers];
561 [letters sendNext:@"C"];
562 [numbers sendNext:@"1"];
563
564 [signalOfSignals sendNext:letters];
565 [numbers sendNext:@"2"];
566 [letters sendNext:@"D"];
567
568 #endif
569
570 }
571
572 -(void)gestureRecognizerReceivedTouch:(UIPanGestureRecognizer *)recognizer {
573 if (recognizer.state == UIGestureRecognizerStateBegan) {
574 [self.gestureRecognizerIsRunningSubject sendNext:@(YES)];
575 }
576
577 else if (recognizer.state == UIGestureRecognizerStateChanged) {
578 [self.gestureRecognizerValueSubject sendNext:[NSValue valueWithCGPoint:[recognizer locationInView:self.view]]];
579 }
580
581 else if (recognizer.state == UIGestureRecognizerStateEnded) {
582 [self.gestureRecognizerIsRunningSubject sendNext:@(NO)];
583 }
584 }
585
586
587 - (void)didReceiveMemoryWarning {
588 [super didReceiveMemoryWarning];
589 // Dispose of any resources that can be recreated.
590 }
591
592 /*
593 #pragma mark - Navigation
594
595 // In a storyboard-based application, you will often want to do a little preparation before navigation
596 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
597 // Get the new view controller using [segue destinationViewController].
598 // Pass the selected object to the new view controller.
599 }
600 */
601
602 @end
时间： 2024-10-03 04:52:53