macos 如何将子视图与父 NSView 的中心对齐
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How to align a subview to the center of a parent NSView
提问by Akshay
I'm developing a program in which I am programmatically adding an NSImageView to a custom NSView class. While creating the image-view, I am passing the frame of the parent container.
我正在开发一个程序，在其中我以编程方式将 NSImageView 添加到自定义 NSView 类。在创建图像视图时，我正在传递父容器的框架。
-(NSImageView *)loadNSImage:(NSString *)imageName frame:(NSRect)frame{
imageName = [[NSBundle mainBundle] pathForResource:imageName ofType:@"png"];
NSImage *image = [[NSImage alloc] initWithContentsOfFile:imageName];
NSImageView *imageView = [[NSImageView alloc]initWithFrame:frame];
[imageView setImage:image];
[imageView setImageScaling:NSImageScaleProportionallyUpOrDown];
[imageView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable | NSViewMaxXMargin | NSViewMaxYMargin | NSViewMinXMargin | NSViewMinYMargin];
[imageView setImageAlignment:NSImageAlignCenter];
[image release];
return imageView;
}
Then I am using the addSubViewmethod to add this into the Custom View. The problem is that the image sticks to the bottom-left of the parent view. How can I place this image in the center of the parent view?
然后我使用该addSubView方法将其添加到自定义视图中。问题是图像粘在父视图的左下角。如何将此图像放置在父视图的中心？
I have tried adding an offset to the frame origin, but that doesn't really work when the window is resized, or if an image with a different size is loaded.
我曾尝试向框架原点添加偏移量，但是当调整窗口大小或加载不同大小的图像时，这实际上不起作用。
Any help would be appreciated.
任何帮助，将不胜感激。
回答by d11wtq
I'm not sure if this is the best way to do it, but I just do simple math when I want to center a subview inside its parent.
我不确定这是否是最好的方法，但是当我想将子视图居中放置在其父视图中时，我只是做简单的数学运算。
You need to set all the margins to be auto-resizable if you want it to stay centered.
如果您希望它保持居中，则需要将所有边距设置为自动调整大小。
[subview setFrameOrigin:NSMakePoint(
round((NSWidth([parentView bounds]) - NSWidth([subview frame])) / 2),
round((NSHeight([parentView bounds]) - NSHeight([subview frame])) / 2)
)];
[subview setAutoresizingMask:NSViewMinXMargin | NSViewMaxXMargin | NSViewMinYMargin | NSViewMaxYMargin];
This is just calculating the margins required to get a centered origin.
这只是计算获得居中原点所需的边距。
If you need the centered frame before you invoke initWithFrame:then just use the above logic to compute the frame origin values.
如果在调用之前需要居中的框架，initWithFrame:则只需使用上述逻辑来计算框架原点值。
回答by dengST30
Objective - Cin macOS Catalina , Version 10.15.3
Objective -macOS Catalina 中的C，版本 10.15.3
more readable @d11wtq's answer
更具可读性的@d11wtq 的回答
CGFloat x = (NSWidth(parentView.bounds) - subviewWidth) * 0.5;
CGFloat y = (NSHeight(parentView.bounds) - subviewHeight) * 0.5;
CGRect f = CGRectMake(x, y, subviewWidth, subviewHeight);
subview = [[NSView alloc] initWithFrame: f];
subview.autoresizingMask = NSViewMinXMargin | NSViewMaxXMargin | NSViewMinYMargin | NSViewMaxYMargin;
回答by black_pearl
Swift 5@d11wtq's answer
斯威夫特 5@d11wtq 的回答
let x = (parentView.bounds.width - subviewWidth) * 0.5
let y = (parentView.bounds.height - subviewHeight) * 0.5
let f = CGRect(x: x, y: y, width: subviewWidth, height: subviewHeight)
let subview = NSView(frame: f)
subview.autoresizingMask = [.minXMargin, .maxXMargin, .minYMargin, .maxYMargin ]
回答by user3301487
Try This. in .h
试试这个。在.h
@property (strong, nonatomic) IBOutlet UIView *CoinsPurchaseView;
@property (strong, nonatomic) IBOutlet UIView *CoinsPurchaseView;
in .m
在.m
self.CoinsPurchaseView.center = self.view.center;
[self.view addSubview:self.CoinsPurchaseView];
