我一定在这里做错了什么：
我的 Cocoa 应用程序有一个围绕自定义视图的滚动视图，而该自定义视图又具有一个文本视图。我只希望看到一个“这是一个”字符串，但角落里还有一个额外的字符串。我已将代码减少到非常少的程度，但仍然不明白我的错误是什么，所以我在这里寻找线索。
自定义视图的视图控制器如下，但为简单起见，这里是项目的链接。
#import "TTTSimpleCtrlView.h"
@interface TTTSimpleCtrlView ()
@property (strong,nonatomic) NSTextView *tv1;
@property (strong,nonatomic) NSTextStorage *ts;
@end
@implementation TTTSimpleCtrlView
- (void) awakeFromNib {
NSFont *font = [NSFont fontWithName:@"Courier New Bold" size:20.0f];
NSMutableParagraphStyle *styleModel = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[styleModel setLineHeightMultiple:1.0];
// [styleModel setLineSpacing:fontRect.size.height * 2];
NSDictionary *textAttrs = [NSDictionary dictionaryWithObjectsAndKeys: font, NSFontAttributeName,
[NSColor blackColor] ,NSForegroundColorAttributeName,
[NSColor whiteColor], NSBackgroundColorAttributeName,
styleModel, NSParagraphStyleAttributeName,
nil];
NSString *pilcrowStr = @"This is a test.";
NSAttributedString *s = [[NSAttributedString alloc] initWithString:pilcrowStr attributes:textAttrs];
NSRect rect = [s boundingRectWithSize:NSMakeSize(INFINITY,INFINITY)options:0];
NSLayoutManager *lm = [[NSLayoutManager alloc] init];
NSTextContainer *tc = [NSTextContainer new];
[tc setContainerSize:s.size];
[lm addTextContainer:tc];
_ts = [[NSTextStorage alloc] init];
[_ts setAttributedString:s];
[_ts addLayoutManager:lm];
[lm replaceTextStorage:_ts];
rect.origin.x = 10;
rect.origin.y = rect.size.height;
NSTextView *v = [[NSTextView alloc] initWithFrame:rect textContainer:tc];
[v setDrawsBackground:YES];
[self addSubview:v];
}
- (BOOL) isFlipped {
return YES;
}
- (void)drawRect:(NSRect)rect
{
NSLog(@"drawRect & %lu subviews",self.subviews.count);
for (NSTextView *v in self.subviews) {
if(CGRectIntersectsRect(v.frame, rect) || CGRectContainsRect(rect, v.frame)) {
[v drawRect:rect];
NSLog(@"frame = %@",NSStringFromRect(v.frame));
}
}
[super drawRect:rect];
}