ios 从文档目录加载图像
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Loading an Image from documents directory
提问by YuAo
I cant get my Image(.png) to display.
我无法显示我的 Image(.png)。
I check that it exists at the path I use, and it does. But no image appears.
我检查它是否存在于我使用的路径中，并且确实存在。但是没有图像出现。
Here is what I've been trying:
这是我一直在尝试的：
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *outputPath = [documentsDir stringByAppendingPathComponent:[fileList objectAtIndex:indexPath.row]];
NSFileManager *fileManager = [[[NSFileManager alloc] init] autorelease];
NSString *imgPath = [[outputPath stringByReplacingOccurrencesOfString:@"mov" withString:@"png"]retain];
if ([fileManager fileExistsAtPath:imgPath])
{
NSLog(@"FOUND IMG");
NSLog(imgPath);
}
NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:imgPath]];
UIImage *thumbNail = [[UIImage alloc] initWithData:imgData];
UIImageView * imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 120, 120)];
[imgView setImage:thumbNail];
[cell addSubview:imgView];
[imgView release];
The debug output that confirms the file exists
确认文件存在的调试输出
FOUND IMG
2011-12-26 12:42:23.066 iGeo2[412:707] /var/mobile/Applications/1A2B0D85-CDB1-4E4B-
9509-EF68B1A0E720/Documents/0.009000.png
I'm a little baffled. Anybody see where I've made the mistake?
我有点困惑。有人看到我在哪里犯了错误吗？
Many Thanks, -Code
非常感谢，-代码
I've tried a few other methods, but nothing ever appears.
我尝试了其他一些方法，但没有出现任何内容。
采纳答案by iHunter
You should use [NSURL fileURLWithPath:imgPath]instead of [NSURL URLWithString:imgPath]. Image path is not a valid url, it needs a file://prefix.
你应该使用[NSURL fileURLWithPath:imgPath]而不是[NSURL URLWithString:imgPath]. 图片路径不是有效的 url，它需要一个file://前缀。
回答by YuAo
Try to use
尝试使用
NSData *imgData = [NSData dataWithContentsOfFile:imgPath];
UIImage *thumbNail = [[UIImage alloc] initWithData:imgData];
or
或者
NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL fileURLWithPath:imgPath]];
UIImage *thumbNail = [[UIImage alloc] initWithData:imgData];
回答by Arslan
You need to give proper file url which will be
您需要提供正确的文件网址，这将是
NSURL *imgURL = [NSURL fileURLWithPath:imgPath];
then initialize your image with proper imgURL var and finally to add the image to your cell you need to do the following
然后使用适当的 imgURL var 初始化您的图像，最后将图像添加到您的单元格中，您需要执行以下操作
[cell.contentView addSubview:imgView];
I hope it may solve your problem.
我希望它可以解决您的问题。
回答by Bobby
imageView.image = [UIImage imageWithContentsOfFile:[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"Filename"]];
回答by Zaid Pathan
Swift 4
斯威夫特 4
Code:
代码：
extension FileManager {
class func getImage(named: String) -> UIImage? {
let imagePath = getImagePath(named: named)
return UIImage(contentsOfFile: imagePath)
}
class func getImagePath(named: String) -> String {
let fileManager = FileManager.default
let documentDir = try! fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
return documentDir.appendingPathComponent(named).path
}
}
Usage:
用法：
let image = FileManager.getImage(named: "image.png")
回答by Pankaj purohit
Your url is perfect.
你的网址是完美的。
You need to initialise image with following line
您需要使用以下行初始化图像
UIImage *thumbNail=[UIImage imageWithContentsOfFile:imagePath];
now do this
现在做这个
[imgView setImage:thumbNail];
[cell addSubview:imgView];
