1:用UIImageView作為背景，但直接把按鈕或者UITextField放在上面無法相應事件。

解決辦法：UIImageView默認的UserInteractionEnabled是NO，把它修改成YES,或者可以直接在XCODE上面的view有個屬性勾選User Interaction Enabled遇到的場景(在滾動視圖里面放一個圖片視圖，在圖片視圖上又放置一個按鍵，發現一直沒有響應效果);

2:AFnetWorking報"Request failed: unacceptable content-type: text/html"

對應到自己的項目里面，我用的是AFNetworking這套網絡請求包，需要改的是：AFURLResponseSerialization.m文件223行：self.acceptableContentTypes = [NSSetsetWithObjects:@"application/json", @"text/html",@"text/json",@"text/javascript", nil];加上@"text/html",部分，其實就是添加一種服務器返回的數據格式。

3:NSMutableArray和NSArray的相互轉換

// NSArray --> NSMutableArray NSMutableArray *myMutableArray = [myArray mutableCopy]; // NSMutableArray --> NSArray NSArray *myArray = [myMutableArray copy];

4:自定義系統導航條上面的返回按鈕，以及文字，右側收藏按鈕

//中間標題UILabel *navLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];navLabel.text = @"團購詳情";navLabel.textColor = [UIColor whiteColor];navLabel.font = [UIFont systemFontOfSize:18];navLabel.textAlignment = NSTextAlignmentCenter;self.navigationItem.titleView = navLabel;//右邊收藏按鈕UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeCustom];rightButton.frame = CGRectMake(0, 0, 20, 20);[rightButton setBackgroundImage:LOAD_IMAGE(@"meishoucang") forState:UIControlStateNormal];[rightButton addTarget:self action:@selector(doShouCang) forControlEvents:UIControlEventTouchUpInside];UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithCustomView:rightButton];self.navigationItem.rightBarButtonItem = rightItem;//左邊返回按鈕UIButton *fanHuiButton = [UIButton buttonWithType:UIButtonTypeCustom];fanHuiButton.frame = CGRectMake(0, 0, 30, 40);[fanHuiButton setBackgroundImage:LOAD_IMAGE(@"fanhuijiantou") forState:UIControlStateNormal];[fanHuiButton addTarget:self action:@selector(doFanHui) forControlEvents:UIControlEventTouchUpInside];UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:fanHuiButton];self.navigationItem.leftBarButtonItem = leftItem;導航條上的title字體， 字號 可以這么定義，完全使用系統的 [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor colorWithRed:1.0/255 green:1.0/255 blue:1.0/255 alpha:1], UITextAttributeTextColor,[UIColor clearColor],UITextAttributeTextShadowColor,[UIFont systemFontOfSize:20],UITextAttributeFont,nil]];

5:清理UITableView底部空的列

self.tableView.tableFooterView = [[UIView alloc] init];

?6:如何隱藏navigation跳轉后的頭部右鍵

//隱藏頭部左邊的返回 self.navigationItem.hidesBackButton=YES; //隱藏頭部右邊 self.navigationItem.rightBarButtonItem.customView.hidden=YES;

7:如要給UICollectionViewController視圖設置背景圖

UIImage *image=[UIImage imageNamed:@"AppBg"]; self.collectionView.layer.contents=(id)image.CGImage;

8:可以在其它地方修改rootViewController

UIWindow *window = [UIApplication sharedApplication].keyWindow;window.rootViewController = [[HVWTabBarViewController alloc] init];

9:新浪微博授權登錄報Warning: Attempt to present on whose view is not in the window hierarchy!

IntroductoryViewController *introductory=[mainStoryboard instantiateViewControllerWithIdentifier:@"introductoryview"];UINavigationController *rootNavigationController=[[UINavigationController alloc] initWithRootViewController:introductory];self.window.rootViewController=rootNavigationController;主要問題是a跳轉到b,然后b放一個授權新浪微博的按鍵，增加一個UINavigationController，然后在a跳轉到b時用nav跳轉：UIStoryboard *mainStoryboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];LoginViewController* loginviewControll=[mainStoryboard instantiateViewControllerWithIdentifier:@"loginviewcontroller"];[self.navigationController pushViewController:loginviewControll animated:YES];

10:在引入第三方TcweiboSDK報linker command failed with exit code1(use -v to see invocation)

是因為重復引入libTCWeiboSDK這個類庫，TARGETS-PROJECT-Build Phases-Link Binary With Libraries中，有三個libTcweiboSDK,可以刪除libTCWeiboSDK-I386.a

11:NSUserDefaults存放民NSDictionary

注意：NSUserDefaults支持的數據類型有NSString、 NSNumber、NSDate、 NSArray、NSDictionary、BOOL、NSInteger、NSFloat等系統定義的數據類型。 本次遇到的問題：當NSDictionary里面的值為null時，要寫入NSUserDefaults會報異常（attempt to insert non-property list object）； 解決方式：把字典中的值進行過濾處理，為空的轉化成字符串的空值；代碼如下(創建一個擴展類):@implementation NSDictionary(Common) -(NSDictionary *) changeDictionaryNotNill {NSMutableDictionary *muResult=[[NSMutableDictionary alloc]init];NSEnumerator *enumerator=[self keyEnumerator];id key;while ((key=[enumerator nextObject])) {id value=[self objectForKey:key];if ((NSNull *)value==[NSNull null]) {[muResult setObject:@"" forKey:key];}else{[muResult setObject:value forKey:key];}}return muResult; } @end

?

總結

以上是生活随笔為你收集整理的IOS开发基础知识--碎片8的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。