#import <UIKit/UIKit.h>

@interface TextKit02ViewController : UIViewController

@property (nonatomic,strong) IBOutlet UITextView *textView;

@property (nonatomic,weak) IBOutlet UIImageView *imageView;
// 文本可以排版的区域
@property (nonatomic,strong) NSTextContainer *textContainer;

@end

#import "TextKit02ViewController.h"

@interface TextKit02ViewController ()

@end

@implementation TextKit02ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    CGRect textViewRect = CGRectInset(self.view.bounds, 10.0, 20.0);
    
    // 1、创建储存文本对象textStorage
    NSTextStorage *textStorage = [[NSTextStorage alloc] initWithString:self.textView.text];
    
    // 2、创建文字排版对象layoutManager
    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
    
    // 3、创建文本排版的区域textContainer
    self.textContainer = [[NSTextContainer alloc] initWithSize:textViewRect.size];
    
    // 4、设置textStorage与layoutManager的关系
    [textStorage addLayoutManager:layoutManager];
    
    // 5、设置layoutManager与textContainer的关系
    [layoutManager addTextContainer:self.textContainer];
    
    // 6、重新构建原来控制器视图
    [self.textView removeFromSuperview];
    self.textView = [[UITextView alloc] initWithFrame:textViewRect textContainer:self.textContainer];
    [self.view insertSubview:self.textView belowSubview:self.imageView];
    
    // 7、设置textStorage中文本的风格
    [textStorage beginEditing];
    
    NSDictionary *attrsDic = @{NSTextEffectAttributeName:NSTextEffectLetterpressStyle};
    NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:self.textView.text attributes:attrsDic];
    [textStorage setAttributedString:attrStr];
    
    [textStorage endEditing];
    
    // 8、环绕路径
    self.textView.textContainer.exclusionPaths = @[[self translatedBezierPath]];
   
}

- (UIBezierPath *)translatedBezierPath
{
    CGRect imageRect = [self.textView convertRect:self.imageView.frame fromView:self.view];
    UIBezierPath *newPath = [UIBezierPath bezierPathWithRect:imageRect];
    return newPath;
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end