Question

我有一个包含多行文字的NSTextView。调用-deleteToBeginningOfLine:时，将删除整个字符串，而不是最后一行：

NSTextView *textView = [[NSTextView alloc] initWithFrame:NSZeroRect];

textView.string = @"foo\nbar";
[textView deleteToBeginningOfLine:nil];
NSAssert([textView.string isEqualToString:@"foo\n"], @""); // fail, string is "".

// Modifying the selected range doesn't help.
textView.string = @"foo\nbar";
textView.selectedRange = NSMakeRange(textView.string.length, 0);
[textView deleteToBeginningOfLine:nil];
NSAssert([textView.string isEqualToString:@"foo\n"], @""); // ditto.

// Using \r\n changes nothing.
textView.string = @"foo\r\nbar";
[textView deleteToBeginningOfLine:nil];
NSAssert([textView.string isEqualToString:@"foo\r\n"], @""); // ditto.

一旦视图在窗口中布局，它就会按预期工作。但我想在将视图添加到任何其他视图之前编辑字符串。我如何使这项工作？

Answer 1

创建具有良好框架尺寸的文本视图。

NSTextView *textView = [[NSTextView alloc] initWithFrame:NSMakeRect(0, 0, 1000, 1000)];
textView.string = @"foo\nbar";
[textView deleteToBeginningOfLine:nil];
NSAssert([textView.string isEqualToString:@"foo\n"], @""); // ok.

// Don't make the frame too small.
NSTextView *textView = [[NSTextView alloc] initWithFrame:NSMakeRect(0, 0, 1, 1)];
textView.string = @"foo\nbar";
[textView deleteToBeginningOfLine:nil];
NSAssert([textView.string isEqualToString:@"foo\n"], @""); // fail, string is "foo\nba".

NSTextView deleteToBeginningOfLine：删除整个字符串

1 个答案: