Layout iOS 7上的自定义布局将元素渲染为高

我对iOS 7上的自定义布局有问题。所有内容都显得太高，即在导航栏下。在iOS 6上，即使在使用iOS 7 SDK编译时，它也像一个魅力

下面我发布了用于初始化和布局视图的代码。我不使用Interface Builder，我更愿意不使用。谢谢你的帮助

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.documentTitle = [UITextField new];
        self.documentExtension = [UILabel new];

        self.documentTitle.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Document title"];
        self.documentTitle.font = [UIFont boldSystemFontOfSize:[UIFont systemFontSize] + 1];
        self.documentTitle.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
        self.documentTitle.borderStyle = UITextBorderStyleRoundedRect;
        self.documentTitle.returnKeyType = UIReturnKeyDone;
        self.documentTitle.keyboardType = UIKeyboardTypeDefault;

        self.documentExtension.text = @".pdf";
        self.documentExtension.backgroundColor = [UIColor clearColor];

        [self addSubview:self.documentTitle];
        [self addSubview:self.documentExtension];
    }

    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];

    UIEdgeInsets padding = UIEdgeInsetsMake(12, 10, 12, 10);
    CGRect layoutRect = UIEdgeInsetsInsetRect(self.bounds, padding);
    CGPoint p = layoutRect.origin;

    CGSize tmpSize;
    CGFloat tfSpaceHorizontal = 6;
    CGFloat tfSpaceVertical = 6;

    CGSize tmpSizeDocumentExtension = [self.documentExtension sizeThatFits:CGSizeMake(CGRectGetWidth(layoutRect), 1000)];

    tmpSize = CGSizeMake(
            roundf((CGRectGetWidth(layoutRect) - tfSpaceHorizontal - tmpSizeDocumentExtension.width)),
            32
    );

    self.documentTitle.frame = CGRectMake(
            p.x, p.y,
            tmpSize.width,
            tmpSize.height
    );

    p.x += tmpSize.width + tfSpaceHorizontal;
    CGFloat addedHeight = roundf(tmpSize.height/2 - tmpSizeDocumentExtension.height/2);
    addedHeight = addedHeight > 0 ? addedHeight : 0;
    p.y += addedHeight;

    self.documentExtension.frame = CGRectMake(
            p.x,
            p.y,
            tmpSizeDocumentExtension.width,
            tmpSizeDocumentExtension.height
    );
}

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在iOS 7中，每个视图控制器都使用全屏布局，因此坐标系从状态栏下开始，因此在定位视图时请注意

这在苹果的报告中提到过