Cocoa NSView更改自动调整属性

Question

使用界面构建器，您可以选择对象在调整大小时应该坚持的角落。你怎么能以编程方式做到这一点？

Answer 1

我发现autoresizingBit掩码的命名非常可怕，所以我在NSView上使用了一个类别来使事情变得更加明确：

// MyNSViewCategory.h:
@interface NSView (myCustomMethods)

- (void)fixLeftEdge:(BOOL)fixed;
- (void)fixRightEdge:(BOOL)fixed;
- (void)fixTopEdge:(BOOL)fixed;
- (void)fixBottomEdge:(BOOL)fixed;
- (void)fixWidth:(BOOL)fixed;
- (void)fixHeight:(BOOL)fixed;

@end

// MyNSViewCategory.m:
@implementation NSView (myCustomMethods)

- (void)setAutoresizingBit:(unsigned int)bitMask toValue:(BOOL)set
{
    if (set)
    { [self setAutoresizingMask:([self autoresizingMask] | bitMask)]; }
    else
    { [self setAutoresizingMask:([self autoresizingMask] & ~bitMask)]; }
}

- (void)fixLeftEdge:(BOOL)fixed
{ [self setAutoresizingBit:NSViewMinXMargin toValue:!fixed]; }

- (void)fixRightEdge:(BOOL)fixed
{ [self setAutoresizingBit:NSViewMaxXMargin toValue:!fixed]; }

- (void)fixTopEdge:(BOOL)fixed
{ [self setAutoresizingBit:NSViewMinYMargin toValue:!fixed]; }

- (void)fixBottomEdge:(BOOL)fixed
{ [self setAutoresizingBit:NSViewMaxYMargin toValue:!fixed]; }

- (void)fixWidth:(BOOL)fixed
{ [self setAutoresizingBit:NSViewWidthSizable toValue:!fixed]; }

- (void)fixHeight:(BOOL)fixed
{ [self setAutoresizingBit:NSViewHeightSizable toValue:!fixed]; }

@end

然后可以按如下方式使用：

[someView fixLeftEdge:YES];
[someView fixTopEdge:YES];
[someView fixWidth:NO];

Answer 2

请参阅NSView的setAutoresizingMask:方法和相关的resizing masks。

Answer 3

每个视图都有标志的掩码，通过使用resizing masks中所需行为的OR设置autoresizingMask属性来控制。此外，superview需要配置为resize its subviews。

最后，除了基本的蒙版定义的大小调整选项之外，您还可以通过实施-resizeSubviewsWithOldSize:

来完全控制子视图的布局

Answer 4

@ e.James回答给了我一个想法，只需创建一个更熟悉命名的新枚举：

typedef NS_OPTIONS(NSUInteger, NSViewAutoresizing) {
    NSViewAutoresizingNone                 = NSViewNotSizable,
    NSViewAutoresizingFlexibleLeftMargin   = NSViewMinXMargin,
    NSViewAutoresizingFlexibleWidth        = NSViewWidthSizable,
    NSViewAutoresizingFlexibleRightMargin  = NSViewMaxXMargin,
    NSViewAutoresizingFlexibleTopMargin    = NSViewMaxYMargin,
    NSViewAutoresizingFlexibleHeight       = NSViewHeightSizable,
    NSViewAutoresizingFlexibleBottomMargin = NSViewMinYMargin
};

另外，根据我的研究，我发现@ James.s在NSView添加中有一个严重错误。 Cocoa中的坐标系统在iOS坐标系统中有一个翻转的y轴。因此，为了修复底部和顶部边距，您应该写：

- (void)fixTopEdge:(BOOL)fixed
{ [self setAutoresizingBit:NSViewMaxYMargin toValue:!fixed]; }

- (void)fixBottomEdge:(BOOL)fixed
{ [self setAutoresizingBit:NSViewMinYMargin toValue:!fixed]; }

来自cocoa docs：

  

NSViewMinYMargin

The bottom margin between the receiver and its superview is flexible.
Available in OS X v10.0 and later.