1、案例视图，如下图
2、代码
TextKit01ViewController.h
#import <UIKit/UIKit.h>@interface TextKit01ViewController : UIViewController
@property (nonatomic,strong) IBOutlet UITextView *textView;
// 文本可以排版的区域
@property (nonatomic,strong) NSTextContainer *textContainer;
// 设置文本风格
- (void) markWord:(NSString*)word inTextStorage:(NSTextStorage*)textStorage;@end
TextKit01ViewController.m
#import "TextKit01ViewController.h"@interface TextKit01ViewController ()
@end
@implementation TextKit01ViewController
- (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、重新构建原来的textview控件
[self.textView removeFromSuperview];
self.textView = [[UITextView alloc] initWithFrame:textViewRect textContainer:self.textContainer];
[self.view addSubview:self.textView];// 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];[self markWord:@"我" inTextStorage:textStorage];
[self markWord:@"I" inTextStorage:textStorage];[textStorage endEditing];
}
-(void)markWord:(NSString *)word inTextStorage:(NSTextStorage *)textStorage
{
// 1、创建正则表达式regex
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:word options:0 error:nil];// 2、扫描textStorage中的文本
NSArray *matches = [regex matchesInString:self.textView.text options:0 range:NSMakeRange(0, [self.textView.text length])];// 3、为找到的文本内容设置风格
for (NSTextCheckingResult *match in matches) {
NSRange matchRange = [match range];
[textStorage addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:matchRange];
}
}- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}@end
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