全系列文章索引：

1 【SQL】附加數據庫5120錯誤(拒絕訪問)處理方法

http://jingyan.baidu.com/article/c1a3101e8b34c2de656debbe.html

右鍵需要附加的數據庫文件，彈出屬性對話框，選擇安全標籤頁。找到Authenticated Users用戶名。如未找到，進行Authenticated Users用戶名的添加。

2 【UI】'-[UITableViewControllerloadView] loaded the "XXX" nib but didn't get a UITableView.'

'-[UITableViewController loadView] loaded the"XXX" nib but didn't get a UITableView.'

解決方法：在頭文件中，將所繼承的父類UITableViewController 改成 UIViewController。

3 linux/mac vi命令詳解

linux/mac vi命令詳解

http://blog.csdn.net/youngkingyj/article/details/22713965

4 IOS獲取最新設備型號方法

方法：

#import "sys/utsname.h”

struct utsname systemInfo;

uname(&systemInfo);

NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

http://blog.csdn.net/luoyeffcs/article/details/18610839

5 objective-c ASCII NSString轉換

objective-c ASCII NSString轉換--分享

// NSString to ASCII

NSString *string = @"A";

int asciiCode = [string characterAtIndex: 0]; //65

//ASCII to NSString

int asciiCode = 65;

NSString *string =[NSString stringWithFormat: @"%c",asciiCode]; //A

來源http://blog.sina.com.cn/s/blog_63aaf4690100w981.html

中文字符ASCII碼和NSString相互轉換

http://www.2cto.com/kf/201309/243443.html

6 【UI】UIButton文字居左顯示

UIButton *btn = [[UIButton alloc] init];

btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

7 【網絡】AFNetwork2.0在請求時報錯code=-1016和3840

http://blog.csdn.net/huifeidexin_1/article/details/38844535

在進行網絡請求時出現-1016是因爲只支持text/json，application/json，text/javascript，你可以添加text/html ，一勞永逸的方法是在AFURLResponseSerialization.h裏面搜索self.acceptableContentTypes，然後在裏面添加@"text/html",@"text/plain"。這樣就可以解決-1016的錯誤了，但是隨之而來的是3840錯誤。

Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed.

(Cocoa error 3840.)" (JSON text did not start with array or object and

option to allow fragments not set.) UserInfo=0x9152780 {NSDebugDescription=JSON

text did not start with array or object and option to allow fragments not set.}

你會發現出現此錯誤

怎麼辦呢？

添加如下語句就可以解決問題了

manger.requestSerializer = [AFHTTPRequestSerializer serializer];

manger.responseSerializer = [AFHTTPResponseSerializer serializer];

是否成功了,成功了吧!但是新問題出現了——編碼問題。如果服務器返回a的話，你收到的是<61>，這樣怎麼能行呢。當你用瀏覽器去請求時發現響應頭Content-Type: text/html;charset=UTF-8是這樣的，但是afNetwork 請求是Content-Type:text/plain;charset=ISO-8859-1。爲什麼pc瀏覽器訪問的和用afNetwork訪問的不一致呢? 接着發現其實添加如下二句即可，也不用去修改AFURLResponseSerialization.h 裏面的東西

manger.requestSerializer = [AFHTTPRequestSerializer serializer];

manger.responseSerializer = [AFHTTPResponseSerializer serializer];

把收到的responseObject 轉換一下編碼就OK了。

NSData*doubi= responseObject;

NSString *shabi = [[NSString alloc]initWithData: doubi encoding: NSUTF8StringEncoding];

8 【JSON】NSDictionary與NSString互轉

NSString *str = [dataDic JSONRepresentation];

NSDictionary *resultDic = [htmStr JSONValue];

9 【UI】在UIImageView中添加子按鈕無法響應事件問題

問題分析：

UIImageView默認是不接受事件響應的userInteractionEnabled=NO，所以用戶點擊操作在該控件即被截停了，無法往子控件中傳遞，故需要開啓userInteractionEnabled屬性爲true，以使事件往下傳遞。

_scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];

_scrollView.delegate = self;

// scrollView.userInteractionEnabled = YES;

[self.view addSubview: _scrollView];

_activityIndicatorView = [MDViewUtility createActivityIndicatorViewInView: self.view];

UIImageView *backImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 200)];

[backImageView setImage: [UIImage imageNamed: @"MyCenter_BackgroundImage"]];

//這一句很重要，不然事件無法往下傳遞

backImageView.userInteractionEnabled = YES;

[_scrollView addSubview: backImageView];

_myAccountView = [[MDMyAccountView alloc] initWithFrame: CGRectMake(self.view.frame.size.width/2 - 50, 0, 100, 200) WithVM: _myAccountVM];

[backImageView addSubview: _myAccountView];

[_myAccountView.myScoreButton addTarget: self action: @selector(myScoreButtonClicked:) forControlEvents: UIControlEventTouchUpInside];

UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(myScoreButtonClicked:)];

singleTap1.delegate = self;

[_myAccountView.myPhotoImageView setUserInteractionEnabled: YES];

[_myAccountView.myPhotoImageView addGestureRecognizer: singleTap1];

UITapGestureRecognizer *singleTap2 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(myScoreButtonClicked:)];

singleTap2.delegate = self;

[_myAccountView.myNeedLoginLabel setUserInteractionEnabled: YES];

[_myAccountView.myNeedLoginLabel addGestureRecognizer: singleTap2];

10 【UI】在二級頁面中隱藏Tabbar

在VC初始化時設置屬性：

self.hidesBottomBarWhenPushed=YES;

11 Cocoa/Cocoa.hfile not found

Cocoa/Cocoa.h file not found

創建OC類時，有時OC類會自動包含了文件頭#import <Cocoa/Cocoa.h>,這時報錯：‘Cocoa/Cocoa.h' file not found，這個問題是因爲Cocoa/Cocoa.h爲OSX的庫文件，而不時IOS的庫文件，將其修改爲#import <UIKit/UIKit.h>問題解決。

不過，所有用到NS***的都要修改爲UI***

12 JSONKITisa錯誤的解決辦法

轉載：http://blog.csdn.net/hemuhan/article/details/17753453

在開發IOS的時候，好多第三方庫使用JSONKIT這個庫，在IOS6.0以上的版本編譯的話，會提示 Semantic Issue錯誤。

錯誤顯示：direct access to Objective-C's isa is deprecated in favorof object_getClass()

看資料說是使用 array->isa 這個棄用的函數，網上查大部分的資料都說要使用object_getClass 和object_setClass來更正。

看到Bee中Demo沒有更改這個函數，花費很長時間終於整明白瞭如果使IOS不報這個錯誤

從項目中搜索 Direct usage of 'isa' 將 YES(treat as error) 改爲NO 就可以了

13 【URL】創建並保存Cookie的方法

NSString*cookieString = [NSString stringWithString: [headers objectForKey: @"Cookie"]];

NSMutableDictionary *cookieProperties = [[NSMutableDictionary alloc]init];

[cookieProperties setValue: cookieString forKey:NSHTTPCookieValue];

[cookieProperties setValue:@"QQCookie"forKey:NSHTTPCookieName];

[cookieProperties setValue:@".QQ.com"forKey:NSHTTPCookieDomain];

[cookieProperties setValue:[NSDate dateWithTimeIntervalSinceNow: 60*60] forKey: NSHTTPCookieExpires];

[cookieProperties setValue:@"/" forKey: NSHTTPCookiePath];

NSHTTPCookie *newcookie = [[NSHTTPCookie alloc] initWithProperties: cookieProperties];

[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie: newcookie];

http://ios-iphone.diandian.com/post/2011-09-20/5175529

14 NSDictionary判斷空

字典裏某個鍵key的值可能是空數組～～～那這個[dic objectForkey:key]是什麼？

你猜會是[NSNull null]？

也可能不是～～～但至少是個空數組。

[[dic objectForkey:key] count]會告訴我們結果。

下面的代碼使用了NSNull來判斷字典某個鍵的值是否爲空。但是這種判斷方法，似乎對於空集合類不大奏效。

id object = nil;

// 判斷對象不爲空

if(object) {

}

// 判斷對象爲空

if(object == nil) {

}

// 數組初始化，空值結束

NSArray *array = [[NSArray alloc] initWithObjects:@"First", @"Second", nil];

// 判斷數組元素是否爲空

NSString *element = [array objectAtIndex:2];

if((NSNull *)element == [NSNull null]) {

}

// 判斷字典對象的元素是否爲空

NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys: @"iPhone", @"First", @"iPad", @"Second", nil];

NSString *value = [dictionary objectForKey:@"First"];

if((NSNull *)value == [NSNull null]) {

}

15 NSDate格式化輸出

NSDate*date = [NSDate dateWithTimeIntervalSince1970: [[MDMyUserInfoEntity shareInstance] birthday]];

NSDateFormatter*dateFormatter = [[NSDateFormatter alloc] init];

//設定時間格式,這裏可以設置成自己需要的格式

[dateFormatter setDateFormat:@"yyyy-MM-dd"];

//用[NSDate date]可以獲取系統當前時間

NSString *currentDateStr = [dateFormatter stringFromDate: date];

16 AFNetworking請求HTTPS時發生code=-1012的錯誤

AFNetworking 2.0在請求HTTPS資源的時候，總是發生如下錯誤：

self.securityPolicy = [AFSecurityPolicy policyWithPinningMode: AFSSLPinningModeNone];

//解決“Error Domain=NSURLErrorDomain Code=-1012

"The operation couldn’t be completed.”的問題，AFNetworking 2.0默認在檢查SSL證書的時候比較嚴格self.securityPolicy.allowInvalidCertificates = YES;

解決辦法就是允許使用無效的證書。

17 字符串NSString中去掉空格

在ios開發中 stringByTrimmingCharactersInSet函數可以用來去掉字符串中的任意字符。

例如：

NSString *string1 = @" 11 1 ";

NSString *string2 = [string1 stringByTrimmingCharactersInSet [NSCharacterSet whitespaceAndNewlineCharacterSet]];

這個時候string2的結果是"11 1"

(去處空格的時候只是去除字符串中最前和最後的字符。)

【iOS】字符串NSString中去掉空格

http://blog.csdn.net/chenyong05314/article/details/8752654

NSString過濾字符串

http://blog.sina.com.cn/s/blog_5d2698930100wxvw.html

18 AFNetworking請求未發出去返回一堆html代碼

網絡請求中，域名指向的IP地址錯了

19 MBProgressHud顯示多行文本

+(void) showToastInView:(UIView *)view WithText:(NSString *) text WithDelay:(NSTimeInterval)delay

{

MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo: view animated: YES];

hud.mode = MBProgressHUDModeText;

// hud.labelText = text;

hud.detailsLabelText=text;

hud.detailsLabelFont = [UIFont fontWithName:@"Helvetica" size:16];

hud.detailsLabelColor = [UIColor whiteColor];

hud.margin = 10.f;

hud.yOffset = 0;

hud.alpha = 0.7;

hud.removeFromSuperViewOnHide = YES;

[hudhide:YES afterDelay:delay];

}

20 nestedpush animation can result in corrupted navigation bar

nested push animation can result in corrupted navigation bar.

Finishing up a navigation transition in an unexpected state.Navigation Bar subview tree might get corrupted.

【iphone】返回崩潰：nested pop animation canresult in corrupted navigation bar nested pop animation can re

http://blog.csdn.net/lengshengren/article/details/12616217

IOS開發問題索引（八）