imagenamed | 易学教程

JPG image doesn't load with UIImage imageNamed

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问题 I read on the reference that from iOS version 4.+ with the method imageNamed of UIImage object, the file extension is not required. From UIImage class reference: Special Considerations. On iOS 4 and later, the name of the file is not required to specify the filename extension. Prior to iOS 4, you must specify the filename extension. But it seems that this only work with PNG files. If my code is: [UIImage imageNamed:@"test"]; The image loads only if the file is test.png The image doesn't load

use xcassets without imageNamed to prevent memory problems?

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问题 according to the apple documentation it is recommended to use xcassets for iOS7 applications and reference those images over imageNamed. But as far as I'm aware, there were always problems with imageNamed and memory. So I made a short test application - referencing images out of the xcassets catalogue with imageNamed and started the profiler ... the result was as expected. Once allocated memory wasn't released again, even after I removed the ImageView from superview and set it to nil. I'm

UIImage imageNamed returns nil

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I am pretty new to iOS and Xcode. I tried to load an image with [UIImage imageNamed:@"imageName.png/jpg and so on"]; but it only returns nil. The image should be in my project bundle, considering the fact that I can choose it from drag and drop menus in the InterfaceBuilder and it was added to Xcode via the "Add files to "projectname"..." menu. It makes no difference whether I use .png or .jpg images, the result stays the same: they work via IB but not if I try to run the imageNamed method myself. Matt Hudson There are only a few reasons why an image would come back nil with imageNamed: The

UIImage imageNamed returns nil

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问题 I am pretty new to iOS and Xcode. I tried to load an image with [UIImage imageNamed:@\"imageName.png/jpg and so on\"]; but it only returns nil. The image should be in my project bundle, considering the fact that I can choose it from drag and drop menus in the InterfaceBuilder and it was added to Xcode via the \"Add files to \"projectname\"...\" menu. It makes no difference whether I use .png or .jpg images, the result stays the same: they work via IB but not if I try to run the imageNamed

Dispelling the UIImage imageNamed: FUD

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问题 Edit Feb 2014: Note that this question dates from iOS 2.0! Image requirements and handling have moved on a lot since then. Retina makes images bigger and loading them slightly more complex. With the built in support for iPad and retina images, you should certainly use ImageNamed in your code . I see a lot of people saying imageNamed is bad but equal numbers of people saying the performance is good - especially when rendering UITableView s. See this SO question for example or this article on

Dispelling the UIImage imageNamed: FUD

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Edit Feb 2014: Note that this question dates from iOS 2.0! Image requirements and handling have moved on a lot since then. Retina makes images bigger and loading them slightly more complex. With the built in support for iPad and retina images, you should certainly use ImageNamed in your code . I see a lot of people saying imageNamed is bad but equal numbers of people saying the performance is good - especially when rendering UITableView s. See this SO question for example or this article on iPhoneDeveloperTips.com UIImage 's imageNamed method used to leak so it was best avoided but has been