测试TextKit渲染大文本的效率

#import "RootViewController.h"

#import "FontPool.h"

#import "YXGCD.h"

@interface RootViewController ()<NSLayoutManagerDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor blackColor];

    [[GCDQueue globalQueue] execute:^{

        NSLog(@"start");

        // 数据源

        NSString *string = [NSString stringWithContentsOfURL:[NSBundle.mainBundle URLForResource:@"bubizhidaowoshishui" withExtension:@"txt"] usedEncoding:nil

                                                       error:nil];

        // 文本容器

        NSTextStorage *storage = [[NSTextStorage alloc] initWithString:string];

        // 段落属性

        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

        paragraphStyle.lineHeightMultiple  = .f;                    // 可变行高,乘因数

        paragraphStyle.lineSpacing         = .f;                    // 行间距

        paragraphStyle.minimumLineHeight   = .f;                   // 最小行高

        paragraphStyle.maximumLineHeight   = .f;                   // 最大行高

        paragraphStyle.paragraphSpacing    = .f;                   // 段间距

        paragraphStyle.alignment           = NSTextAlignmentLeft;    // 对齐方式

        paragraphStyle.firstLineHeadIndent = .f;                   // 段落首文字离边缘间距

        paragraphStyle.headIndent          = .f;                    // 段落除了第一行的其他文字离边缘间距

        paragraphStyle.tailIndent          = .f;                    // ???????

        [storage addAttribute:NSParagraphStyleAttributeName

                        value:paragraphStyle

                        range:NSMakeRange(, storage.string.length)];

        // 字体属性

        [storage addAttribute:NSFontAttributeName

                        value:[UIFont fontWithName:CUSTOM_FONT(@"新蒂小丸子体", ) size:.f]

                        range:NSMakeRange(, storage.string.length)];

        [storage addAttribute:NSForegroundColorAttributeName

                        value:[UIColor cyanColor]

                        range:NSMakeRange(, storage.string.length)];

        [[GCDQueue mainQueue] execute:^{

            // 文本容器的布局管理器

            NSLayoutManager *layoutManager = [NSLayoutManager new];

            NSLog(@"step 1");

            // 开始渲染

            [storage addLayoutManager:layoutManager];

            NSLog(@"step 2");

            // 分段显示文本容器中的内容

            CGSize size = CGSizeMake(, );

            NSTextContainer *textContainer1 = [[NSTextContainer alloc] initWithSize:size];

            [layoutManager addTextContainer:textContainer1];

            NSTextContainer *textContainer2 = [[NSTextContainer alloc] initWithSize:size];

            [layoutManager addTextContainer:textContainer2];

            NSTextContainer *textContainer3 = [[NSTextContainer alloc] initWithSize:size];

            [layoutManager addTextContainer:textContainer3];

            NSLog(@"step - 3");

            UITextView *textView = \

                [[UITextView alloc] initWithFrame:CGRectMake(, ,

                                                             size.width,

                                                             size.height + )

                                    textContainer:textContainer1];

            textView.layer.borderWidth = ;

            textView.scrollEnabled     = NO;

            textView.backgroundColor   = [UIColor clearColor];

            textView.editable          = NO;

            [self.view addSubview:textView];

            NSLog(@"step - 4");

        }];

    }];

}

@end