xcode 如何在 NSTextField 中垂直居中对齐文本？
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How do I vertically center align text in a NSTextField?
提问by simon.d
I have an NSTextField and I want to vertically center align the text in it. Basically I need the NSTextField answer of How do I vertically center UITextField Text?
我有一个 NSTextField，我想垂直居中对齐其中的文本。基本上我需要如何垂直居中 UITextField 文本的 NSTextField 答案？
Anyone got some pointers? Thanks!
有人得到一些指点吗？谢谢！
回答by NSGod
You could subclass NSTextFieldCellto do what you want:
你可以子类化做NSTextFieldCell你想做的事：
MDVerticallyCenteredTextFieldCell.h:
MDVerticallyCenteredTextFieldCell.h：
#import <Cocoa/Cocoa.h>
@interface MDVerticallyCenteredTextFieldCell : NSTextFieldCell {
}
@end
MDVerticallyCenteredTextFieldCell.m:
MDVerticallyCenteredTextFieldCell.m:
#import "MDVerticallyCenteredTextFieldCell.h"
@implementation MDVerticallyCenteredTextFieldCell
- (NSRect)adjustedFrameToVerticallyCenterText:(NSRect)frame {
// super would normally draw text at the top of the cell
NSInteger offset = floor((NSHeight(frame) -
([[self font] ascender] - [[self font] descender])) / 2);
return NSInsetRect(frame, 0.0, offset);
}
- (void)editWithFrame:(NSRect)aRect inView:(NSView *)controlView
editor:(NSText *)editor delegate:(id)delegate event:(NSEvent *)event {
[super editWithFrame:[self adjustedFrameToVerticallyCenterText:aRect]
inView:controlView editor:editor delegate:delegate event:event];
}
- (void)selectWithFrame:(NSRect)aRect inView:(NSView *)controlView
editor:(NSText *)editor delegate:(id)delegate
start:(NSInteger)start length:(NSInteger)length {
[super selectWithFrame:[self adjustedFrameToVerticallyCenterText:aRect]
inView:controlView editor:editor delegate:delegate
start:start length:length];
}
- (void)drawInteriorWithFrame:(NSRect)frame inView:(NSView *)view {
[super drawInteriorWithFrame:
[self adjustedFrameToVerticallyCenterText:frame] inView:view];
}
@end
You can then use a regular NSTextFieldin Interface Builder, and specify MDVerticallyCenteredTextFieldCell(or whatever you want to name it) as the custom class for the text field's text field cell (select the textfield, pause, then click the textfield again to select the cell inside the text field):
然后，您可以NSTextField在 Interface Builder 中使用常规，并指定MDVerticallyCenteredTextFieldCell（或任何您想命名的名称）作为文本字段的文本字段单元格的自定义类（选择文本字段，暂停，然后再次单击文本字段以选择文本域）：
回答by Beninho85
Swift 3.0 version (Create a custom subclass for NSTextFieldCell):
Swift 3.0 版本（为 NSTextFieldCell 创建自定义子类）：
override func drawingRect(forBounds rect: NSRect) -> NSRect {
var newRect = super.drawingRect(forBounds: rect)
let textSize = self.cellSize(forBounds: rect)
let heightDelta = newRect.size.height - textSize.height
if heightDelta > 0 {
newRect.size.height -= heightDelta
newRect.origin.y += (heightDelta / 2)
}
return newRect
}
回答by Vladislav Senyukov
It's better to use boundingRectForFontand the function ceilf()when calculating possible maximum font height, because the above-mentioned solution causes text to be cut off under the baseline. So the adjustedFrameToVerticallyCenterText:will look like this
最好在计算可能的最大字体高度时使用boundingRectForFont和 函数ceilf()，因为上述解决方案会导致文本在基线下被截断。所以adjustedFrameToVerticallyCenterText:看起来像这样
- (NSRect)adjustedFrameToVerticallyCenterText:(NSRect)rect {
CGFloat fontSize = self.font.boundingRectForFont.size.height;
NSInteger offset = floor((NSHeight(rect) - ceilf(fontSize))/2);
NSRect centeredRect = NSInsetRect(rect, 0, offset);
return centeredRect;
}
