根据每个分段中的标题更改分段控件的宽度? [英] Change width of a segmented control based on titles in each segment?

问题描述

我喜欢这样开始:

Starts like this, which I like:

但是随后我添加了一个细分，并且发生了这种情况:
宽度是在IB中设置的，而不是在代码中设置的.

But then I add a segment and this happens:
The width is set in IB, not in code.

我需要的是一种动态计算宽度的方法.最后，它将执行以下操作:

All I need is a method to calculate width on the fly. At the end, it would do something like this:

control.width = (labelWidths + marginWidths);
// where marginWidths = (marginWidth * control.numberOfSegments)

推荐答案

prgrmr的答案此处中的方法适用于它的预期目的，但事实并非如此.

The method in prgrmr's answer here works fine for its intended purpose, but this is not it.

与其通过自定义UILabel子视图添加不必要的开销，
我已经修改了上面链接中的示例代码来解决这个问题:

Rather than adding unnecessary overhead with custom UILabel subviews,
I've modified the example code in the above link to come up with this:

- (void)resizeSegmentsToFitTitles:(UISegmentedControl *)control {
    CGFloat textWidth = 0; // total width of all text labels
    CGFloat marginWidth = 0; // total width of all margins
    NSUInteger nSegments = control.subviews.count;
    UIView *aSegment = [control.subviews objectAtIndex:0];
    UIFont *theFont = nil;

    // get font for segment title label
    for (UILabel *label in aSegment.subviews) {
        if ([label isKindOfClass:[UILabel class]]) {
            theFont = label.font;
            break;
        }
    }

    // calculate width of text in each segment
    for (NSUInteger i = 0; i < nSegments; i++) {
        NSString *title = [control titleForSegmentAtIndex:i];
        CGFloat width = [title sizeWithFont:theFont].width;
        CGFloat margin = 15;

        if (width > 200) {
            NSString *ellipsis = @"…";
            CGFloat width2 = [ellipsis sizeWithFont:theFont].width;

            while (width > 200-width2) {
                title = [title substringToIndex:title.length-1];
                width = [title sizeWithFont:theFont].width;
            }

            title = [title stringByAppendingString:ellipsis];
        }

        [control setTitle:title forSegmentAtIndex:i];

        textWidth += width;
        marginWidth += margin;
    }

    // resize segments to accomodate text size, evenly split total margin width
    for (NSUInteger i = 0; i < nSegments; i++) {
        // size for label width plus an equal share of the space
        CGFloat textWidth = [[control titleForSegmentAtIndex:i]
                             sizeWithFont:theFont].width;
        // the control leaves a 1 pixel gap between segments if width
        // is not an integer value; roundf() fixes this
        CGFloat segWidth = roundf(textWidth + (marginWidth / nSegments));
        [control setWidth:segWidth forSegmentAtIndex:i];
    }

    // set control width
    [control setFrame:CGRectMake(0, 0, (textWidth + marginWidth), 30)];
}

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