ios – UILabel文本在旋转时截断.怎么修？

我创建了一个水印视图类,当调整大小时,会覆盖一个与边界一样大的文本标签.由于图像尺寸等,这种方法非常适用并且尺寸合适.

现在我想旋转标签.只要应用变换,标签中的文本就会截断.我认为我很接近,但我做的事情很愚蠢,因为我是新手.有任何想法吗？

这是我的班级：

@interface WatermarkView ()
- (CGFloat)biggestBoldFontForString:(NSString*)text inRect:(CGRect)rect;
@end

@implementation WatermarkView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) 
    {
        // create a label that will display the watermark
        mainLabel = [[UILabel alloc] initWithFrame:frame];
        mainLabel.alpha = 0.35;
        mainLabel.BACkgroundColor = [UIColor clearColor];
        mainLabel.text = @"watermark";
        mainLabel.font = [UIFont boldSystemFontOfSize:[self biggestBoldFontForString:mainLabel.text inRect:mainLabel.frame]];
        mainLabel.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;

        // rotate label to a random slanted angle
        mainLabel.transform = CGAffineTransformMakeRotation(RANDOM_FLOAT(-M_PI/5,-M_PI/6));

        [self addSubview:mainLabel];
    }
    return self;
}

- (void)dealloc
{
    [mainLabel release];

    [super dealloc];
}

- (CGFloat)biggestBoldFontForString:(NSString*)text inRect:(CGRect)rect
{
    CGFloat actualFontSize = 200;
    [text sizeWithFont:[UIFont boldSystemFontOfSize:200] minFontSize:1 actualFontSize:&actualFontSize forWidth:rect.size.width lineBreakmode:0];
    return actualFontSize;
}

- (void)layoutSubviews 
{
    [super layoutSubviews];

    mainLabel.font = [UIFont boldSystemFontOfSize:[self biggestBoldFontForString:mainLabel.text inRect:self.frame]];
}

@end