//
//  ViewController.m
//  WeaterImage
//
//  Created by 韩小杰 on 2019/5/24.
//  Copyright © 2019 韩小杰. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic,strong) UIImageView *imgView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.imgView = [[UIImageView alloc] initWithFrame:self.view.frame];
    [self.view addSubview:self.imgView];
    
    UIImage *img = [UIImage imageNamed:@"logo"];

    UIImage *logo = [UIImage imageNamed:@"需要添加水印的图片"];
    self.imgView.image = [self waterMarkImage:img login:logo title:@"@王木木"];
    
    UIImageWriteToSavedPhotosAlbum(self.imgView.image, self, @selector(completedWithImage:error:context:), NULL);
}

-(UIImage *)waterMarkImage:(UIImage *)image login:(UIImage *)login title:(NSString *)title{
    
    CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
    CGFloat screenH = [UIScreen mainScreen].bounds.size.height;
    
    CGFloat W = image.size.width;
    CGFloat H = image.size.height;
    
    CGFloat correctH = 0;
    if(W >= H){
        correctH = 15;
    }else{
        correctH = 0;
    }
    
    CGFloat Font = 13;
    
    CGFloat wC = W/screenW;
    CGFloat hC = H/screenH;
    
    UIGraphicsBeginImageContext(image.size);
    [image drawInRect:CGRectMake(0, 0, W, H)];
    
    Font = Font * wC;

    CGRect postionIconF = [self getCgrect:18 y:615 w:16 h:20 wC:wC hC:hC];
    CGRect postionStrF = [self getCgrect:40 y:615 w:200 h:40 wC:wC hC:hC];
    
    
    CGSize size = [title boundingRectWithSize:CGSizeMake(MAXFLOAT, postionStrF.size.height) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:Font]} context:nil].size;
    
    CGFloat screenHeight = image.size.height - postionIconF.size.height;
    
    CGFloat postionIconFx = (image.size.width - postionIconF.size.width - size.width - 10) /2;
    
    postionIconF = CGRectMake(postionIconFx, screenHeight, postionIconF.size.width, postionIconF.size.height);
    
    CGFloat postionStrFx = postionIconF.origin.x + postionIconF.size.width + 10;
    postionStrF = CGRectMake(postionStrFx, screenHeight, size.width + 20, postionStrF.size.height);
    
    UIImage *loginIcon = login;
    [loginIcon drawInRect:CGRectMake(postionIconF.origin.x, postionIconF.origin.y, postionIconF.size.width, postionIconF.size.width)];
    
    NSString *titleStr = title;
    NSDictionary *positionAttr = @{
                                   NSFontAttributeName: [UIFont boldSystemFontOfSize:Font],
                                   NSForegroundColorAttributeName : [UIColor redColor]
                                   };
    [titleStr drawInRect:postionStrF withAttributes:positionAttr];
    
    UIImage *imageEnd = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return imageEnd;
}

- (CGRect)getCgrect:(CGFloat)x y:(CGFloat)y w:(CGFloat)w h:(CGFloat)h wC:(CGFloat)wC hC:(CGFloat)hC{
    CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
    CGFloat screenH = [UIScreen mainScreen].bounds.size.height;
    
    return CGRectMake(x * screenW/375.0 * wC, y*screenH/667.0 * hC, w * wC, h * wC);
}

- (void)completedWithImage:(UIImage *)image error:(NSError *)error context:(void *)context {
    if (error) {
        NSLog(@"failure");
    } else {
        NSLog(@"successful");
    }
}
@end

WechatIMG68.jpeg