在UILabel中使用文本

Question

这是我的代码

 UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, 50, 300, 50)];
    label.textAlignment = UITextAlignmentCenter;
    label.backgroundColor = [UIColor clearColor];
    label.textColor = [UIColor whiteColor];
    label.textColor.font = [UIFont fontWithName:@"Verdana" size:30];
    label.text = @"A very long string";
     etc...

问题是字体很大,无法放入标签中.它只显示"非常"

怎么做才能显示整个文本.我试过了

label.lineBreakMode = UILineBreakModeWordWrap;
label.numberOfLines = 0;

但它对我不起作用.我想以编程方式做到这一点.

//编辑

CGRect frame = CGRectMake(10, 50, 300, 50);
    NSString *labelString = @"Players.";

    UILabel *howManyUsersLabel = [[UILabel alloc]initWithFrame:frame];
    howManyUsersLabel.textAlignment = UITextAlignmentCenter;
    howManyUsersLabel.backgroundColor = [UIColor clearColor];
    howManyUsersLabel.textColor = [UIColor whiteColor];
    howManyUsersLabel.adjustsFontSizeToFitWidth = NO;
    howManyUsersLabel.numberOfLines = 0;

    CGFloat fontSize = 30;
    while (fontSize > 0.0)
    {
        CGSize size = [labelString sizeWithFont:[UIFont fontWithName:@"Verdana" size:fontSize] constrainedToSize:CGSizeMake(frame.size.width, 10000) lineBreakMode:UILineBreakModeWordWrap];

        if (size.height <= frame.size.height) break;
        fontSize -= 1.0;
        NSLog(@"test");
    }

    howManyUsersLabel.font = [UIFont fontWithName:@"Verdana" size:fontSize];

Answer 1

我想你只需要添加这个:

label.adjustsFontSizeToFitWidth = YES;
label.minimumFontSize = 0;

然后文本将自动调整大小以适合标签.

但请注意,只有在label.numberOfLines = 1时才会真正起作用,因此文本在一行上.

如果您需要将文本换行到多行但仍然缩小以适应,则解决方案更复杂.为此,您需要计算文本的渲染大小,然后在循环中减少它,如下所示:

NSString *theText = @"A long string";
CGRect labelRect = CGRectMake(10, 50, 300, 50);
label.adjustsFontSizeToFitWidth = NO;
label.numberOfLines = 0;

CGFloat fontSize = 30;
while (fontSize > 0.0)
{
    CGSize size = [theText sizeWithFont:[UIFont fontWithName:@"Verdana" size:fontSize] constrainedToSize:CGSizeMake(labelRect.size.width, 10000) lineBreakMode:UILineBreakModeWordWrap];

    if (size.height <= labelRect.size.height) break;

    fontSize -= 1.0;
}

//set font size
label.font = [UIFont fontWithName:@"Verdana" size:fontSize];

这基本上只是缩小了字体大小,直到它适合标签.

更新:

从iOS7开始,多行文本也会自动缩小adjustsFontSizeToFitWidth = YES,因此不再需要此答案的第二部分(除非您仍支持iOS 6及更早版本).