objective-c UITableViewCell 的 imageView 适合 40x40
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UITableViewCell's imageView fit to 40x40
提问by slatvick
I use the same big images in a tableView and detailView. Need to make imageView filled in 40x40 when an imags is showed in tableView, but stretched on a half of a screen. I played with several properties but have no positive result:
我在 tableView 和 detailView 中使用相同的大图像。当在 tableView 中显示图像但在屏幕的一半上拉伸时，需要使 imageView 填充为 40x40。我玩了几个属性，但没有积极的结果：
[cell.imageView setBounds:CGRectMake(0, 0, 50, 50)];
[cell.imageView setClipsToBounds:NO];
[cell.imageView setFrame:CGRectMake(0, 0, 50, 50)];
[cell.imageView setContentMode:UIViewContentModeScaleAspectFill];
I am using SDK 3.0 with build in "Cell Objects in Predefined Styles".
我正在使用带有内置“预定义样式的单元格对象”的 SDK 3.0。
回答by PapaSmurf
I put Ben's code as an extension in my NS-Extensions file so that I can tell any image to make a thumbnail of itself, as in:
我将 Ben 的代码作为扩展名放在我的 NS-Extensions 文件中，以便我可以告诉任何图像制作自己的缩略图，如下所示：
UIImage *bigImage = [UIImage imageNamed:@"yourImage.png"];
UIImage *thumb = [bigImage makeThumbnailOfSize:CGSizeMake(50,50)];
Here is .h file:
这是 .h 文件：
@interface UIImage (PhoenixMaster)
- (UIImage *) makeThumbnailOfSize:(CGSize)size;
@end
and then in the NS-Extensions.m file:
然后在 NS-Extensions.m 文件中：
@implementation UIImage (PhoenixMaster)
- (UIImage *) makeThumbnailOfSize:(CGSize)size
{
UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
// draw scaled image into thumbnail context
[self drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *newThumbnail = UIGraphicsGetImageFromCurrentImageContext();
// pop the context
UIGraphicsEndImageContext();
if(newThumbnail == nil)
NSLog(@"could not scale image");
return newThumbnail;
}
@end
回答by Ben Lachman
I cache a thumbnail version since using large images scaled down on the fly uses too much memory.
我缓存了一个缩略图版本，因为使用动态缩小的大图像会占用太多内存。
Here's my thumbnail code:
这是我的缩略图代码：
- (UIImage *)thumbnailOfSize:(CGSize)size {
if( self.previewThumbnail )
return self.previewThumbnail; // returned cached thumbnail
UIGraphicsBeginImageContext(size);
// draw scaled image into thumbnail context
[self.preview drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *newThumbnail = UIGraphicsGetImageFromCurrentImageContext();
// pop the context
UIGraphicsEndImageContext();
if(newThumbnail == nil)
NSLog(@"could not scale image");
self.previewThumbnail = newThumbnail;
return self.previewThumbnail;
}
Just make sure you properly clear the cached thumbnail if you change your original image (self.preview in my case).
如果您更改原始图像（在我的情况下为 self.preview），请确保正确清除缓存的缩略图。
回答by alex_c
I have mine wrapped in a UIView and use this code:
我将我的包裹在 UIView 中并使用以下代码：
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
[self addSubview:imageView];
imageView.frame = self.bounds;
(self is the wrapper UIView, with the dimensions I want - I use AsyncImageView).
（self 是包装器 UIView，具有我想要的尺寸 - 我使用AsyncImageView）。
回答by guiller
I thought Ben Lachman's suggestion of generating thumbnails in advance rather than on the fly was smart, so I adapted his code so it could handle a whole array and to make it more portable (no hard-coded property names).
我认为 Ben Lachman 提前生成缩略图而不是即时生成缩略图的建议是明智的，因此我调整了他的代码，以便它可以处理整个数组并使其更具可移植性（没有硬编码的属性名称）。
- (NSArray *)arrayOfThumbnailsOfSize:(CGSize)size fromArray:(NSArray*)original {
NSMutableArray *temp = [NSMutableArray arrayWithCapacity:[original count]];
for(UIImage *image in original){
UIGraphicsBeginImageContext(size);
[image drawInRect:CGRectMake(0,0,size.width,size.height)];
UIImage *thumb = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[temp addObject:thumb];
}
return [NSArray arrayWithArray:temp];
}
回答by Wolfcow
you might be able to use this?
你可以用这个吗？
yourTableViewController.rowImage = [UIImage imageNamed:@"yourImage.png"];
and/or
和/或
cell.image = yourTableViewController.rowImage;
and if your images are already 40x40 then you shouldn't have to worry about setting bounds and stuff... but, i'm also new to this, so, i wouldn't know, haven't played around with Table View row/cell images much
如果您的图像已经是 40x40，那么您不必担心设置边界和其他东西...但是，我也是新手，所以，我不知道，还没有玩过 Table View 行/cell 图像很多
hope this helps.
希望这可以帮助。
回答by Jonah
I was able to make this work using interface builder and a tableviewcell. You can set the "Mode" properties for an image view to "Aspect Fit". I'm not sure how to do this programatically.
我能够使用界面构建器和 tableviewcell 来完成这项工作。您可以将图像视图的“模式”属性设置为“Aspect Fit”。我不确定如何以编程方式执行此操作。
回答by Jonah
Try setting UIImageView.autoresizesSubviewsand/or UIImageView.contentStretch.
尝试设置UIImageView.autoresizesSubviews和/或UIImageView.contentStretch.
