照片中间微博字上横线怎么弄的字怎么弄上去的？

来源：蜘蛛抓取(WebSpider) 时间：2018-04-02 06:18 标签： 微博字上横线怎么弄
IOS图片上添加水印文字（微博上图片上得水印文字）
建一个类目（不知道怎么建的可以去百度一下） UIImage的类目
类目的.h文件 文件名为UIImage+watermark
@interface UIImage (watermark)
//定义一个方法
- (UIImage *)watermarkImage:(NSString *)
.m文件的实现
#import &UIImage+watermark.h&
@implementation UIImage (watermark)
- (UIImage *)watermarkImage:(NSString *)text{
//1.获取上下文
UIGraphicsBeginImageContext(self.size);
//2.绘制图片
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
//3.绘制水印文字
CGRect rect = CGRectMake(0, self.size.height-20, self.size.width, 20);
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];
style.alignment = NSTextAlignmentC
//文字的属性
NSDictionary *dic = @{
NSFontAttributeName:[UIFont systemFontOfSize:13],
NSParagraphStyleAttributeName:style,
NSForegroundColorAttributeName:[UIColor whiteColor]
//将文字绘制上去
[text drawInRect:rect withAttributes:dic];
//4.获取绘制到得图片
UIImage *watermarkImage = UIGraphicsGetImageFromCurrentImageContext();
//5.结束图片的绘制
UIGraphicsEndImageContext();
return watermarkI
然后再viewController 的视图上添加一个UIImageView 导入类目（UIImage+watermark）文件
#import &ViewController.h&
#import &UIImage+watermark.h&
@interface ViewController ()
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIImage *image = [UIImage imageNamed:@&baymax.jpg&];
//调用类目的方法实现功能
UIImage *img = [image watermarkImage:@&@大白&];
UIImageView *imageView = [[UIImageView alloc] initWithImage:img];
// imageView.frame = self.view.
[self.view addSubview:imageView];
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.

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