ios UILabel 自动换行,缩小字体代码

既可以自动换行,又可以根据字符串的长度来调整字体的大小。

代码:

_label = [ [ UILabel alloc ] initWithFrame: CGRectMake( 20 , 280 , 280 , 100 ) ];
    _label.textAlignment = UITextAlignmentCenter;
    _label.adjustsFontSizeToFitWidth = YES;
    _label.minimumFontSize = 2;
    _label.alpha = 0.4;
    [ self.view addSubview: _label ];
    
    // 文字
    message = [ [ NSString alloc ] init ];
    message = [ resultSet.resultDictionary objectForKey: @"saying" ];
    
    CGFloat actualFontSize;

    int numberOfLine = message.length / 23;
    if ( !numberOfLine )
    {
        numberOfLine = 1;
    }
    
     [ message sizeWithFont: [ UIFont systemFontOfSize: 18 ] minFontSize: 6 actualFontSize: &actualFontSize forWidth: 300*numberOfLine lineBreakMode: NSLineBreakByWordWrapping ];

    _label.text = message;
    [ _label setFont: [ UIFont systemFontOfSize: actualFontSize  ] ];
    _label.numberOfLines = numberOfLine + 1;


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