11. NSTimer và cùng làm ứng dụng "Trắc nghiệm vui"

[thaihoasvhouse]

Ở đây mảng CacDapAn đã lưu toàn bộ thành phần của mảng CacPhuongAn đã loại bỏ đi dấu "-", mình thấy đúng mà......

[IMG]styles/default/xenforo/clear.png[/IMG] Thêm NSArray *CacDapAn; vào ViewController.h

Sorry nhé !

[Ichigo214]

CacDapAn ở đây mình khai báo là biến cục bộ mà... đầu cần phải khai báo biến toàn cục đâu... [IMG]styles/default/xenforo/clear.png[/IMG]

[donghonam]

CacDapAn ở đây mình khai báo là biến cục bộ mà... đầu cần phải khai báo biến toàn cục đâu... [IMG]styles/default/xenforo/clear.png[/IMG]

oài, nản nhỉ thế bạn sửa được lỗi chưa. cho xem cái project tý :v

[bienhoabay]

Mình vừa đọc xong bài này, có một số thắc mắc:

- Cái NSTimer có tác dụng gì trong bài này

---

Để giống với thực tế thì:

- mỗi câu hỏi chỉ được chọn 1 lần,

- đặt thời gian cho từng câu hỏi

- khi hết thời gian sẽ không cho chọn Segment

code sao giờ nhỉ !^%&?

[kt_viewsmart]

Mình vừa đọc xong bài này, có một số thắc mắc:

- Cái NSTimer có tác dụng gì trong bài này

---

Để giống với thực tế thì:

- mỗi câu hỏi chỉ được chọn 1 lần,

- đặt thời gian cho từng câu hỏi

- khi hết thời gian sẽ không cho chọn Segment

code sao giờ nhỉ !^%&?

Bài của mình, post lên cho mọi người tham khảo và góp ý:



ViewController.h



<div class="bbCodeBlock bbCodePHP">
<div class="type">PHP:</div>
<div class="code"><code>
#import&nbsp;<UIKit/UIKit.h>

@interface&nbsp;ViewController&nbsp;:&nbsp;UIViewController
{
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*CauHoiSo;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*DemThoiGian;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*NoiDungCauHoi;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*DapAnA;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*DapAnB;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*DapAnC;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UISegmentedControl&nbsp;*ChonDapAn;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UILabel&nbsp;*DungSai;
&nbsp;&nbsp;&nbsp;&nbsp;IBOutlet&nbsp;UIButton&nbsp;*CauTiepTheo;

&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;i;
&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;Diem;
&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;CauHoiDangLam;
&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;SoCauSai;
&nbsp;&nbsp;&nbsp;&nbsp;NSTimer&nbsp;*ThoiGian;
&nbsp;&nbsp;&nbsp;&nbsp;NSArray&nbsp;*CacCauHoi;
&nbsp;&nbsp;&nbsp;&nbsp;NSArray&nbsp;*CacDapAn;
&nbsp;&nbsp;&nbsp;&nbsp;NSArray&nbsp;*DapAnDung;
}

-&nbsp;(IBAction)ChonDapAnid)sender;

-&nbsp;(IBAction)CauTiepTheoid)sender;

@end

</code></div>
</div>ViewController.m



<div class="bbCodeBlock bbCodePHP">
<div class="type">PHP:</div>
<div class="code"><code>
#import&nbsp;"ViewController.h"

@interface&nbsp;ViewController&nbsp;()

@end

@implementation&nbsp;ViewController

-&nbsp;(void)viewDidLoad
{
&nbsp;&nbsp;&nbsp;&nbsp;[super&nbsp;viewDidLoad];
&nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;Do&nbsp;any&nbsp;additional&nbsp;setup&nbsp; after&nbsp;loading&nbsp;the&nbsp;view,&nbsp;typica lly&nbsp;from&nbsp;a&nbsp;nib.

&nbsp;&nbsp;&nbsp;&nbsp;i&nbsp;=&nbsp;30;
&nbsp;&nbsp;&nbsp;&nbsp;Diem&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;SoCauSai&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;CauHoiDangLam&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;CacCauHoi&nbsp;=&nbsp;[NSArray&nbsp;arrayWithObjects:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"Hãng&nbsp;nào&nbsp;đã&nbsp;sản&nbsp;xuất& nbsp;ra&nbsp;điện&nbsp;thoại&nbsp;thông&nbsp ;minh&nbsp;iPhone?",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"Tháng&nbsp;dài&nbsp;nhất&nbsp;có&nbsp;bao&nb sp;nhiêu&nbsp;ngày?",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"Microsoft&nbsp;đã&nbsp;sản&nbsp;xuất&nbsp;r a&nbsp;hệ&nbsp;điều&nbsp;hành&nbsp;nào&nbsp ;bên&nbsp;dưới?",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"Hệ&nbsp;điều&nbsp;hành&nbsp;nào&nbsp;đư� ��c&nbsp;sử&nbsp;dụng&nbsp;trên&nbsp;iPad",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"Bác&nbsp;Hồ&nbsp;sinh&nbsp;ra&nbsp;vào&nbsp;n ăm&nbsp;nào?",&nbsp;nil];
&nbsp;&nbsp;&nbsp;&nbsp;CacDapAn&nbsp;=&nbsp;[NSArray&nbsp;arrayWithObjects:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"Apple-Microsoft-Google",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"29&nbsp;ngày-30&nbsp;ngày-31&nbsp;ngày",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"MacOS&nbsp;X-Windows-iOS",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"iOS-Android-Windows",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"1980-1890-1899",&nbsp;nil];
&nbsp;&nbsp;&nbsp;&nbsp;DapAnDung&nbsp;=&nbsp;[NSArray&nbsp;arrayWithObjects:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"0",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"2",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"1",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"0",
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@"1",&nbsp;nil];;

&nbsp;&nbsp;&nbsp;&nbsp;ThoiGian&nbsp;=&nbsp;[NSTimer&nbsp;scheduledTimerWithTimeInterval:1&nbsp;target:self&nbsp;selector:@selector(DemThoiGian)&nbsp;userInfo:nil&nbsp;repeats:YES];

&nbsp;&nbsp;&nbsp;&nbsp;[ChonDapAn&nbsp;setSelectedSegmentIndex:-1];
&nbsp;&nbsp;&nbsp;&nbsp;[CauHoiSo&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Câu&nbsp;hỏi&nbsp;số&nbsp;%i:",&nbsp;CauHoiDangLam&nbsp;+&nbsp;1]];
&nbsp;&nbsp;&nbsp;&nbsp;[NoiDungCauHoi&nbsp;setText:[CacCauHoi&nbsp;objectAtIndex:CauHoiDangLam]];

&nbsp;&nbsp;&nbsp;&nbsp;NSArray&nbsp;*CacCauTraLoi&nbsp;=&nbsp;[[CacDapAn&nbsp;objectAtIndex:CauHoiDangLam]&nbsp;componentsSeparatedByString:@"-"];
&nbsp;&nbsp;&nbsp;&nbsp;[DapAnA&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Đáp&nbsp;án&nbsp;A:&nbsp;%@",&nbsp;[CacCauTraLoi&nbsp;objectAtIndex:0]]];
&nbsp;&nbsp;&nbsp;&nbsp;[DapAnB&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Đáp&nbsp;án&nbsp;B:&nbsp;%@",&nbsp;[CacCauTraLoi&nbsp;objectAtIndex:1]]];
&nbsp;&nbsp;&nbsp;&nbsp;[DapAnC&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Đáp&nbsp;án&nbsp;C:&nbsp;%@",&nbsp;[CacCauTraLoi&nbsp;objectAtIndex:2]]];
}

-&nbsp;(void)didReceiveMemoryWarning
{
&nbsp;&nbsp;&nbsp;&nbsp;[super&nbsp;didReceiveMemoryWarning];
&nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;Dispose&nbsp;of&nbsp;any&nbsp;resources&nbsp ;that&nbsp;can&nbsp;be&nbsp;recreated.
}

-&nbsp;(void)DemThoiGian
{
&nbsp;&nbsp;&nbsp;&nbsp;i--;
&nbsp;&nbsp;&nbsp;&nbsp;[DemThoiGian&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Còn&nbsp;lại:&nbsp;%i&nbsp;giây",&nbsp;i]];
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(i&nbsp;==&nbsp;0)&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[ThoiGian&nbsp;invalidate];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DungSai&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Bạn&nbsp;được&nbsp;%i&nbsp;điểm.&nbsp;Sa i&nbsp;%i/%i&nbsp;câu",&nbsp;Diem,&nbsp;SoCauSai,&nbsp;CauHoiDangLam&nbsp;+&nbsp;1]];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[CauTiepTheo&nbsp;setTitle:@"Chơi&nbsp;lại"&nbsp;forState:UIControlStateNormal];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[ChonDapAn&nbsp;setEnabled:FALSE];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;CauHoiDangLam&nbsp;=&nbsp;-1;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;Diem&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;SoCauSai&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;}
}

-&nbsp;(IBAction)ChonDapAnid)sender&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;NSInteger&nbsp;DapAnDuocChon&nbsp;=&nbsp;[ChonDapAn&nbsp;selectedSegmentIndex];
&nbsp;&nbsp;&nbsp;&nbsp;NSInteger&nbsp;DapAnChinhThuc&nbsp;=&nbsp;[[DapAnDung&nbsp;objectAtIndex:CauHoiDangLam]&nbsp;intValue];
&nbsp;&nbsp;&nbsp;&nbsp;[ChonDapAn&nbsp;setEnabled:FALSE];
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(DapAnDuocChon&nbsp;==&nbsp;DapAnChinhThuc)&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;Diem++;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DungSai&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Trả&nbsp;lời&nbsp;ĐÚNG&nbsp;câu&nbsp;% i",&nbsp;CauHoiDangLam&nbsp;+&nbsp;1]];
&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;else&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;SoCauSai++;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DungSai&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Trả&nbsp;lời&nbsp;SAI&nbsp;câu&nbsp;%i",&nbsp;CauHoiDangLam&nbsp;+&nbsp;1]];
&nbsp;&nbsp;&nbsp;&nbsp;}
}

-&nbsp;(IBAction)CauTiepTheoid)sender&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;[ChonDapAn&nbsp;setEnabled:TRUE];
&nbsp;&nbsp;&nbsp;&nbsp;[ChonDapAn&nbsp;setSelectedSegmentIndex:-1];
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(CauHoiDangLam&nbsp;==&nbsp;-1)&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[CauTiepTheo&nbsp;setTitle:@"Câu&nbsp;tiếp&nbsp;theo"&nbsp;forState:UIControlStateNormal];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;i&nbsp;=&nbsp;30;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;ThoiGian&nbsp;=&nbsp;[NSTimer&nbsp;scheduledTimerWithTimeInterval:1&nbsp;target:self&nbsp;selector:@selector(DemThoiGian)&nbsp;userInfo:nil&nbsp;repeats:YES];
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(CauHoiDangLam&nbsp;==&nbsp;3)&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[CauTiepTheo&nbsp;setTitle:@"Xem&nbsp;kết&nbsp;quả"&nbsp;forState:UIControlStateNormal];
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(CauHoiDangLam&nbsp;==&nbsp;4)&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;//&nbsp;Xuất&nbsp;kết&nbsp;quả
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[ThoiGian&nbsp;invalidate];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DungSai&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Bạn&nbsp;được&nbsp;%i&nbsp;điểm.&nbsp;Sa i&nbsp;%i/%i&nbsp;câu",&nbsp;Diem,&nbsp;SoCauSai,&nbsp;CauHoiDangLam&nbsp;+&nbsp;1]];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[CauTiepTheo&nbsp;setTitle:@"Chơi&nbsp;lại"&nbsp;forState:UIControlStateNormal];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[ChonDapAn&nbsp;setEnabled:FALSE];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;CauHoiDangLam&nbsp;=&nbsp;-1;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;Diem&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;SoCauSai&nbsp;=&nbsp;0;
&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;else&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;CauHoiDangLam++;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[CauHoiSo&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Câu&nbsp;hỏi&nbsp;số:&nbsp;%i",&nbsp;CauHoiDangLam&nbsp;+&nbsp;1]];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[NoiDungCauHoi&nbsp;setText:[CacCauHoi&nbsp;objectAtIndex:CauHoiDangLam]];
&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;NSArray&nbsp;*CacCauTraLoi&nbsp;=&nbsp;[[CacDapAn&nbsp;objectAtIndex:CauHoiDangLam]&nbsp;componentsSeparatedByString:@"-"];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DapAnA&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Đáp&nbsp;án&nbsp;A:&nbsp;%@",&nbsp;[CacCauTraLoi&nbsp;objectAtIndex:0]]];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DapAnB&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Đáp&nbsp;án&nbsp;B:&nbsp;%@",&nbsp;[CacCauTraLoi&nbsp;objectAtIndex:1]]];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp ;[DapAnC&nbsp;setText:[NSString&nbsp;stringWithFormat:@"Đáp&nbsp;án&nbsp;C:&nbsp;%@",&nbsp;[CacCauTraLoi&nbsp;objectAtIndex:2]]];
&nbsp;&nbsp;&nbsp;&nbsp;}
}
@end


</code></div>
</div>Fix lỗi như sau:

• Sau khi giá trị Segment thay đổi, nó sẽ bị Disable đi: [ChonDapAn setEnabled:FALSE];

Khi hết thời gian (mình cho 30 giây để hoàn thành câu hỏi) thì:

• Thời gian ngừng đếm: [ThoiGian invalidate];
• Xuất ra kết quả
• Các đáp án sẽ bị disable
• Set title cho nút là Chơi lại: [CauTiepTheo setTitle: @"Chơi lại" forState:UIControlStateNormal];
• Cho các biến đếm (Điểm, số câu sai, thời gian... trở về 0)

Khi trả lời xong 5 câu hỏi thì:

• Thời gian ngừng đếm: [ThoiGian invalidate];
• Xuất ra kết quả
• Các đáp án sẽ bị disable
• Set title cho nút là Chơi lại: [CauTiepTheo setTitle: @"Chơi lại" forState:UIControlStateNormal];
• Cho các biến đếm (Điểm, số câu sai, thời gian... trở về 0)