I have UIImageView what have a role of a background image in View. I want to load two different images in this UIImageView, depending on what state is selected in toggle switch in Settings Bundle.
What the best way to do it?
Try something like this:
NSUserDefaults* settings = [NSUserDefaults standardUserDefaults];
NSString* imgName = [settings boolForKey:#"toggle_switch"] ? #"switch_on.png" : #"switch_off.png";
UIImage* img = [UIImage imageNamed:imgName];
[imageView setImage:img];
Related
I have a very weird issue. I have a watch app and I am trying to display an image programatically. When I debug the code, I can see the image is correctly loaded but on simulator or real device I cannot see the image. I have added that image in both watch and extension bundle resources.
Firstly I use the code below to open the view.
NSArray *objects =[NSArray arrayWithObjects:#"MainPageView",#"InterfaceController",#"PoseImageView",nil];
[self presentControllerWithNames:objects contexts:nil];
Inside PoseImageView I am trying to display an image with:
UIImage *imgTest = [UIImage imageNamed:[NSString stringWithFormat:#"1.jpg", strAngle]]; // I can see 1.jpg in debugger
[_imgPose setImage: imgTest];
The image is not there on watch or simulator. I am wondering how to fix the issue.
Note: From assets its not loading as well.
Note2: I can only display the image if the view is initial view.
You are trying to use imageNamed for .jpg which will not work.
Try using
NSString *filePath = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:#"imageName"] ofType:#"jpg"];
UIImage *theImage = [UIImage imageWithContentsOfFile:filePath];
I'm trying to add a UIBarButtonItem containing a UIImage to a UIToolbar. The image keeps being tinted and I can't get it to show as the original colored image - all I want to do is display an image, verbatim, in a UIBarButtonItem! I'm following the directions in the iOS 7 transition guide to set the image rendering mode to UIImageRenderingModeAlwaysOriginal.
UIImage *image = [UIImage imageNamed:#"myImage.png"];
image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
UIBarButtonItem *ratingImage = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleBordered target:nil action:nil];
[toolbar setItems:[NSArray arrayWithObjects:ratingImage, nil] animated:YES];
One thing to note is that I set the tintColor for the main UIWindow of my app right when it loads...maybe this isn't important with regard to my issue, but thought I'd mention it.
I spent an evening trying to figure this out as well. You were very close to the solution.
The trick is to instantiate the UIImage with the rendering mode.
Instead of doing:
UIImage *image = [UIImage imageNamed:#"myImage.png"];
image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
do this:
UIImage *image = [[UIImage imageNamed:#"myImage.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
and it works!
In my case, I had dragged a Navigation bar to my viewcontroller in the IB, and added the BarButtonItem. But don't provide the item an image in the IB. Make an outlet and assign it the UIImage (like we created above) by doing this:
[myCustomBarButtonItem setImage:image];
Hope this works for you.
UIImageRenderingModeAlwaysOriginal can also be set by selecting the image in your Assets.xcassets "folder" in XCode and setting the "Render as" dropdown to "Original image".
For Swift 2.1+ it would look like this:
let image : UIImage? = UIImage(named:"myImage.png")!.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
UPDATED Swift 3
let image : UIImage? = UIImage(named:"myImage.png")!.withRenderingMode(.alwaysOriginal)
The accepted answer is fine but if you placed the UIBarButtonItem in a storyboard or xib then you can just:
Go to the Assets catalog where the image lives
Select the image
Go to the attributes inspector (cmd-opt-4)
Set "Render As" to "Original Image"
Only do this if you want all instances of this image to show up without tinting.
If you want it to work for versions of iOS less than v7, you might need to to this:
UIImage *image = [UIImage imageNamed:#"myImage.png"];
#try {
image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
} #catch (NSException *exception) {
}
Since imageWithRenderingMode: is an iOS 7 method, you'll get an exception if you try and use it with a lesser version.
I am trying to change the color of my tab bar icons when the tabs are UNselected. Right now the color is default grey and I can change the color to whatever color I want for when it IS selected.
Apple's dev library said to change the image rendering to "original" instead of its default mode "template." I did that. then it says to use initWithTitle:image:selectedImage: I tried to do that as well but I think that's where I messed up. I wrote this in my viewcontroller.m file. What's wrong here?
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIImage *stat = [UIImage imageNamed:#"white_stats.png"];
stat = [stat imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
(instancetype)initWithTitle:(NSString *)nil image:(UIImage *)stat selectedImage:(UIImage *)stat;
}
The problem is that you are using the same UIImage with UIImageRenderingModeAlwaysOriginal in both places.
Your code should look something like
UIImage *stat = [UIImage imageNamed:#"white_stats.png"];
UIImage *statAlwaysOriginal = [stat imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
self.tabBarItem = [[UITabBarItem alloc] initWithTitle:nil image:statAlwaysOriginal selectedImage:stat];
The other thing is that there are some actual syntax errors in your post (in the UITabBarItem initialization, but I suspect you just pasted it incorrectly.
Currently, I'm working on the client for the website. I have tonne of images that I need to load to my TableView. Here is what I'm currectly doing:
NSDictionary *propertyItems = [self.items objectAtIndex:indexPath.row];
cell.fio.font = [UIFont boldSystemFontOfSize:17.0f];
if([propertyItems objectForKey:#"online"] == [NSNumber numberWithInt:1])
cell.fio.textColor = [UIColor colorWithRed:0.3 green:0.6 blue:0.3 alpha:1.0];
dispatch_queue_t downloadPhotosQueue = dispatch_queue_create("downloadPhotosQeue", NULL);
dispatch_async(downloadPhotosQueue, ^{
NSData *photosData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://www.example.com/%#", [propertyItems objectForKey:#"photo_trumb"]]]];
dispatch_async(dispatch_get_main_queue(), ^{
cell.pic.image = [UIImage imageWithData:photosData];
});
});
cell.fio.text = [propertyItems objectForKey:#"fio"];
I'm doing this in cellForRowAtIndexPath: method.
Everything is loading fast. But the problem is, when I'm scrolling my table down, and after again up, the images are reloading over and over again.
Question: Is there any way to easily cache my UIImages that I'm getting from the server? So if they are loaded once, they wouldn't reload over and over again, while I'm running the app. Maybe I'm doing something wrong?
Thanks in advance!
I strongly recommend AsyncImageView. I use it and it works like a charm. Just set the image url and it handles everything itself.
AsyncImageView *imageView = [[AsyncImageView alloc]init];
imageView.imageURL = [NSURL URLWithString:#"https://www.google.es/logos/classicplus.png"];
It caches the image in memory so it won't retrieve it from the server again. It will also release them when receiving a memory warning.
To load image from a website I use AFNetworking. It provides a class to load an image from an URL:
Start by adding #import "UIImageView+AFNetworking" to the top of a
controller or a view implementation file. This category adds methods
to UIImageView, like:
[imageView setImageWithURL:[NSURL URLWithString:#"…"]];
i recommend this library to accomplish what you want.
in cellForRowAtIndexPath:
[cell.imageView setImageWithURL:
[NSURL URLWithString:[NSString stringWithString:#"www.yourimagepath.path"]]
placeholderImage:[UIImage imageNamed:#"no_image.jpg"]];
the library will cache the image for you. you can also set the setHolder of the image, so it wont look like a blank image while the images are downloading.
The problem is here :
NSData *photosData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://www.example.com/%#", [propertyItems objectForKey:#"photo_trumb"]]]];
dataWithContentsOfURL
It launch a request to the Url everytime the function is called (everytime you scrolled).
You need to load all the picture before cellForRowAtIndexPath.
Like in ViewDidLoad.
You can just store them in an array and display your picture's array in cellForRowAtIndexPath.
If it's really fast to load like you say : jsut load picture Once in CellForRowAtIndexPath. Store them in a mutableArray. And check if the picture already exist .
is it possible to convert the HTML page to image in cocoa?
Actually i have created the complete view in the HTML and now i want to convert the whole html preview to the image (any jpeg or png etc.).
I couldn't find any resource or sample on the web, which provides some sort of help on my above queries.It's highly appreciated if someone could share his wisdom on how I can achieve this.
Thanks in advance..
First off, I'd like to thank sergio... his answer got me started but I thought I'd share some of the code that I didn't find obvious that I had to write to make it work:
Here's how to make a thumbnail for a page without ever having it displayed:
// Your width and height can be whatever you like, but if you want this to render
// off screen, you need an x and y bigger than the superview's width and height
UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectMake(largerScreenDimension, largerScreenDimension, largerScreenDimension, largerScreenDimension)];
[self.view addSubview:webView]; // UIWebViews without an assigned superview don't load ever.
webView.delegate = self; // or whoever you have implement UIWebViewDelegate
webView.scalesToFit = YES; // This zooms the page appropriately to fill the entire thumbnail.
[webView loadRequest:[NSURLRequest requestWithURL:url]];
Then implement this in your delegate:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
UIGraphicsBeginImageContext(webView.bounds.size);
[webView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *webViewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *thumbnailData = UIImagePNGRepresentation(webViewImage);
[webView removeFromSuperview];
}
Finally, to display this thumbnail you'll need something like:
thumbnailImageView.image = [UIImage imageWithData:thumbnailData];
As a bonus thing I'll mention, I wanted multiple thumbnails to be generated at once. I found using objc_setAssociatedObject() and objc_getAssociatedObject() to be very helpful with keeping track of which webView was loading which thumbnail. Going into detail on how that worked is beyond the scope of this question, though.
You can draw your view in an image context, like this:
UIWebView* view = ...
....
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imagedata = UIImagePNGRepresentation(viewimage);
NSString *encodedString = [imageData base64Encoding];
Another option would be using Quartz PDF engine to create a PDF.