单击时TextField中的NSAttributedString更改/重置

Question

我正在关注苹果的这个指南,但它并没有真正起作用.

基本上,我正在尝试通过自定义WindowController类向窗口中的NSTextField添加超链接.我能够让超链接处理一些问题:

• 当我将鼠标悬停在超链接上时,我会得到一个'I bean'(指示您可以选择文本的光标).我想要一只通常出现在超链接上的手
• 当我单击超链接文本时,它会在浏览器中成功打开链接,但随后会更改文本大小和格式(例如,它不再居中,返回默认值).现在,当我将鼠标悬停在它上面时,我得到了一只手.

经过一些实验,我发现最初的字符串格式(例如大小,我点击它之前的字体)是我创建标签的.xib文件的格式.点击之后,它变成了一些默认字体,我似乎无法以任何方式影响.但是超链接仍然存在.

这是一些代码:

AboutWindowController.h

#import "AboutWindowController.h"

@interface AboutWindowController ()

@end

@implementation AboutWindowController

- (id)initWithWindow:(NSWindow *)window
{
    self = [super initWithWindow:window];
    if (self) {
        // Initialization code here.
    }
    return self;
}

- (void)windowDidLoad
{
    [super windowDidLoad];

    [self.testLabel setAllowsEditingTextAttributes:YES];
    [self.testLabel setSelectable:YES];

    NSMutableAttributedString* string1 = [[NSMutableAttributedString alloc] init];

    NSString* inString = @"Apple Computer";
    NSURL* aURL = [NSURL URLWithString:@"www.google.com"];

    NSMutableAttributedString* attrString = [[NSMutableAttributedString alloc] initWithString: inString];
    NSRange range = NSMakeRange(0, [attrString length]);

    [attrString beginEditing];
    [attrString addAttribute:NSLinkAttributeName value:[aURL absoluteString] range:range];

    // make the text appear in blue
    [attrString addAttribute:NSForegroundColorAttributeName value:[NSColor blueColor] range:range];

    // next make the text appear with an underline
    [attrString addAttribute:
     NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:NSSingleUnderlineStyle] range:range];

    [attrString endEditing];


    [string1 appendAttributedString:  attrString];


    [self.testLabel setAttributedStringValue:string1];
    [self.testLabel setFont:[NSFont fontWithName:@"Helvetica" size:20]];
}
@end

AboutWindowController.h

#import <Cocoa/Cocoa.h>

@interface AboutWindowController : NSWindowController
@property (weak) IBOutlet NSTextField *testLabel;

@end

.xib非常简单:它是一个带有标签的窗口,我将标签正确链接到.h文件(我相信)

谢谢您的帮助.我会尝试定期回来回答任何问题/澄清.编辑:请检查我对bikram答案的评论,以了解我的情况.

Answer 1

您遇到的问题是NSMutableAttributedString试图强制其格式化并NSTextField强制其自己的格式化。

我的主 XIB 只有菜单，而我的 windowController XIB 有一个Label NSTextField。

窗口控制器：

@interface TFTWindowController : NSWindowController

@property (weak) IBOutlet NSTextField *testLabel;

@end

@implementation TFTWindowController

- (id)initWithWindow:(NSWindow *)window
{
    self = [super initWithWindow:window];
    if (self) {
        // Initialization code here.
    }
    return self;
}

- (void)awakeFromNib {

}

- (void)windowDidLoad
{
    [super windowDidLoad];
    [self.testLabel setAllowsEditingTextAttributes:YES];
    [self.testLabel setSelectable:YES];

    NSMutableAttributedString* string1 = [[NSMutableAttributedString alloc] init];

    NSString* inString = @"Apple Computer";
    NSURL* aURL = [NSURL URLWithString:@"www.google.com"];

    NSMutableAttributedString* attrString = [[NSMutableAttributedString alloc] initWithString:inString];
    NSRange range = NSMakeRange(0, [attrString length]);

    [attrString beginEditing];
    [attrString addAttribute:NSLinkAttributeName value:[aURL absoluteString] range:range];

    // make the text appear in blue
    [attrString addAttribute:NSForegroundColorAttributeName value:[NSColor blueColor] range:range];

    // next make the text appear with an underline
    [attrString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:NSSingleUnderlineStyle] range:range];
    [attrString addAttribute:NSFontAttributeName value:[NSFont fontWithName:@"Helvetica" size:20] range:range];

    [attrString endEditing];


    [string1 appendAttributedString:  attrString];


    [self.testLabel setAttributedStringValue:string1];
    [self.testLabel setFont:[NSFont fontWithName:@"Helvetica" size:20]];
}

@end

应用程序委托：

@interface TFTAppDelegate : NSObject <NSApplicationDelegate>

@property(nonatomic, strong)TFTWindowController *windowController;

@end

@implementation TFTAppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    // Insert code here to initialize your application
    self.windowController = [[TFTWindowController alloc] initWithWindowNibName:@"TFTWindowController"];
    [_windowController showWindow:nil];
}