objective-c - 调整成为FirstResponder 和 resignFirstResponder 的 View 大小 - Cocoa (OS X)

Question

我有一个原始宽度很小的搜索字段(因为这样看起来更好)。但是，当用户单击搜索字段时，我想将其宽度增大一定量。当用户点击外部时，我想将其调整为原始大小。我还想用动画来调整所有大小。

这是我到目前为止所拥有的:

#define kAddedWidth 85

@implementation ToolbarSearchField

- (id)initWithFrame: (NSRect)frameRect
{
    self = [super initWithFrame: frameRect];
    if (self) {
        originalSize = self.frame.size.width;
    }

    return self;
}
- (void)awakeFromNib
{
    [super awakeFromNib];
    originalSize = self.frame.size.width;
}

- (BOOL)becomeFirstResponder
{    
    NSRect newFrame = NSMakeRect(self.frame.origin.x, self.frame.origin.y, originalSize + kAddedWidth, self.frame.size.height);    
    [[self animator] setFrame: newFrame];

    return [super becomeFirstResponder];
}

- (BOOL)resignFirstResponder
{    
    NSRect newFrame = NSMakeRect(self.frame.origin.x, self.frame.origin.y, originalSize, self.frame.size.height);
    [[self animator] setFrame: newFrame];

    return [super resignFirstResponder];
}

@end

originalSize 是一个 iVar。

问题是这并没有调整任何东西的大小。单击字段或外部不会执行任何操作。

我做了一些 NSLog 调试，似乎当我单击该字段时，becomeFirstResponder 被调用，并且在调用 resignFirstResponder 后立即取消了调整大小动画。然而，该字段仍然处于事件状态并闪烁插入点。有什么想法吗？

解决方案:

感谢 Peter Hosey 的回答，我成功解决了这个问题。这是我的解决方案:

#define kAddedWidth (self.superview.bounds.size.width - self.frame.origin.x * 2 - originalSize)

@implementation ToolbarSearchField

- (id)initWithFrame: (NSRect)frameRect
{
    self = [super initWithFrame: frameRect];
    if (self) {
        originalSize = self.frame.size.width;
    }

    return self;
}
- (void)awakeFromNib
{
    [super awakeFromNib];
    originalSize = self.frame.size.width;
}

- (void)textDidBeginEditing: (NSNotification*)notification
{    
    [super textDidBeginEditing: notification];
    isEditing = YES;

    NSRect newFrame = NSMakeRect(self.frame.origin.x, self.frame.origin.y, originalSize + kAddedWidth, self.frame.size.height);
    [[self animator] setFrame: newFrame];
}
- (void)textDidEndEditing: (NSNotification*)notification
{    
    [super textDidEndEditing: notification];
    isEditing = NO;

    if ([self.stringValue isEqualToString: @""]) {
        NSRect newFrame = NSMakeRect(self.frame.origin.x, self.frame.origin.y, originalSize, self.frame.size.height);
        [[self animator] setFrame: newFrame]; 
    }
}

- (void)mouseDown: (NSEvent*)theEvent
{
    if (!isEditing) {
        NSRect newFrame = NSMakeRect(self.frame.origin.x, self.frame.origin.y, originalSize + kAddedWidth, self.frame.size.height);
        [[self animator] setFrame: newFrame];
    }

    [super mouseDown: theEvent];
}

每当单击该字段且尚未编辑该字段时，都会将其动画化为更大的尺寸。每当字段结束编辑时，仅当字段没有文本时才设置动画。如果它有文本，那么最好不要使字段变小。

Answer 1

字段不处理文本输入。该责任由字段编辑器承担，它是窗口拥有的 NSText(或其某些子类)的实例。

您可以尝试实现 the textDidBeginEditing: method和the textDidEndEditing: method相反。

一个search for “field editor”在几个不同的编程指南中出现了几个相关结果。