cocoa-touch | 易学教程

Inability to create my CIFilter classes from string

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问题 After creating this question myself about the inability to create my own UIImageView classes by name I am facing a similar problem, this time for CIFilter subclasses that are not solved by the accepted answer on the other question. Said that, this is the problem. I am creating subclasses of CIFilter class, something like MyEffectFilter1 , MyEffectFilter1 , etc. These subclasses have this convenience method for the creation of specific images: + (instancetype)novo { MyEffectFilter1 * newFilter

How to display images in the uiwebview

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问题 I am implementing a UIWebView. In that I just need to display an iamges. But I am not able to do it. Please check out my code, and please let me know does I make any mistake. NSString *absStirng=[[[NSBundle mainBundle] resourceURL] absoluteString]; appendString =[appendString stringByAppendingString:@"<html>"]; appendString =[appendString stringByAppendingString:@"<body>"]; appendString =[appendString stringByAppendingString:@"<a href='/#/'><img src="]; appendString =[appendString

UBER Ride Reminder Api Responding 403 Forbidden Response

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问题 I am working on UBER ride reminders api.i am trying to post ride reminder using my server_token.passing required parameter but in response i am getting 403 forbidden response. my http request is as follows. NSDictionary *event=@{ @"time":event_time, @"name":event_name }; NSMutableDictionary *params = [[NSMutableDictionary alloc]init]; [params setValue:reminder.reminder_time forKey:@"reminder_time"]; [params setValue:reminder.phone_number forKey:@"phone_number"]; [params setValue:event forKey:

Internet Connection : NURLConnection didFailWithError method not called

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问题 I face a problem when develop an Iphone application and test it through Iphone Simulator. In my Iphone application, there exist a button. When I click on this button, the code will check whether the Iphone is connected to internet or not. If is connected, then it will start load data from server and then insert data to my application's local database. And show a view which display the loaded data. If internet is not connected, the didFailWithError method will called and pop up a alert to

Internet Connection : NURLConnection didFailWithError method not called

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how set images on buttons of navigation bar?

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问题 I need to put images on add,cancel and back buttons of navigation bar. I have done with add button but not getting for back button. even with this add button image it shows back blue color custom button.how to set for this? UIBarButtonItem *addButton=[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"bar_add_button.png"] style:UIBarButtonSystemItemAdd target:self action:@selector(addNote)]; 回答1: // Initialize the UIButton UIImage *buttonImage = [UIImage imageNamed:@"buttonImage.png"

Logic for adding images and scroll icon to the table view

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问题 I have a table view, and I am adding four UIImageView s to a row, so in total I have five rows and twenty image views. I am inserting images one by one into the cell. The second row will only start to fill once all four image views are filled. I need some logic for this. I mean, how can I check which place is next to be filled in the table view and at which event? How can I add images one by one to the UIImageView s? Also, initially only two rows will be shown. After filling these two rows,

UIActivityViewController inside a Container View

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问题 I use a UIActivityViewController inside a Container View. I want to share some text by using Email, twitter and facebook. While the last two works perfectly i have a problem with Email. The problem is that the composer view doesn't dismisses either by canceling the event nor by trying to send it! When the ActivityView appears i get the following message: Launch Services: Registering unknown app identifier com.apple.mobilemail failed Launch Services: Unable to find app identifier com.apple

Solid solution to flexibly resize UIView based on subviews

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问题 Imagine you have four or so views, all width 100, different heights. You have a wrapper view W which holds them all. A | B | W C | D | the heights of the small views can change. At that time you want them all to move, float, appropriately, and resize W. Now, I was just about to write a few lines of code to do this. So .. (1) you'd have W find all the subviews and list them in order from top to bottom. Then (2) each time there is a change, you'd (3) reposition each of ABCD. the position of

From string with locale to date on iphone sdk

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问题 I trying to find a way to convert a string into a date with a given locale identifier. I have for example an italian date (locale: it_IT) I want to convert into a valid date object. NSDate *GLDateWithString(NSString *string, NSString *localeIdentifier) { [NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehavior10_4]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:localeIdentifier]; [formatter setLocale