Main.storyboard

Main.storyboard

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="5053" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" initialViewController="vXZ-lx-hvc">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
    </dependencies>
    <scenes>
        <!--View Controller-->
        <scene sceneID="ufC-wZ-h7g">
            <objects>
                <viewController id="vXZ-lx-hvc" customClass="LWTViewController" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="kh9-bI-dsS">
                        <rect key="frame" x="0.0" y="0.0" width="320" height="480"/>
                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                        <subviews>
                            <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" id="tF8-9P-CEF">
                                <rect key="frame" x="0.0" y="0.0" width="320" height="480"/>
                                <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                            </imageView>
                        </subviews>
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                    </view>
                    <connections>
                        <outlet property="imageView" destination="tF8-9P-CEF" id="Hph-ej-7S9"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="x5A-6p-PRh" sceneMemberID="firstResponder"/>
            </objects>
        </scene>
    </scenes>
    <simulatedMetricsContainer key="defaultSimulatedMetrics">
        <simulatedStatusBarMetrics key="statusBar"/>
        <simulatedOrientationMetrics key="orientation"/>
        <simulatedScreenMetrics key="destination"/>
    </simulatedMetricsContainer>
</document>

LWTViewController.h

#import <UIKit/UIKit.h>

@interface LWTViewController : UIViewController

@end

LWTViewController.m

//
//  LWTViewController.m
//  Quartz2D练习 -- 绘制水印的image分类
//
//  Created by apple on 14-6-10.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTViewController.h"
#import "UIImage+WaterStain.h"

@interface LWTViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation LWTViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UIImage *newImage = [UIImage imageWithImageName:@"scene" waterStainIconName:@"logo"];
    UIImage *newImage1 = [UIImage imageWithImageName:@"scene" waterStainNSString:@"我是水印" CGSize:CGSizeMake(MAXFLOAT, MAXFLOAT) font:[UIFont systemFontOfSize:7.0] padding:5];
    
    /*
     // 测试图片效果
    self.imageView.image = newImage;
    self.imageView.frame = CGRectMake(50, 50, imageX, imageY);
    */
    // 保存图片
    // 将图片传承二进制数据
    NSData *data = UIImagePNGRepresentation(newImage);
    NSData *data1 = UIImagePNGRepresentation(newImage1);
    
    // 保存图片的地址
    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"waterStain.png"];
    NSString *path1 = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"waterStain1.png"];
    
    NSLog(@"%@",path);
    
    // 保存图片
    [data writeToFile:path atomically:YES];
    [data1 writeToFile:path1 atomically:YES];
    
}

@end

UIImage+WaterStain.h

//
//  UIImage+WaterStain.h
//  Quartz2D练习 -- 绘制水印的image分类
//
//  Created by apple on 14-6-10.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImage (WaterStain)
/**
 *  给图片添加左上角图片水印
 *
 *  @param imageName 要添加水印的图片
 *  @param iconName  水印图片
 *
 *  @return 添加了水印的图片
 */
+ (UIImage *)imageWithImageName:(NSString *)imageName waterStainIconName:(NSString *)iconName;
/**
 *  给图片右下角添加文字图片水印
 *
 *  @param imageName 要添加水印的图片
 *  @param waterStr  添加的水印文字
 *  @param maxSize   文字最大范围
 *  @param textFont  字体大小
 *  @param padding   文字的内边距
 *
 *  @return 添加了水印的图片
 */
+ (UIImage *)imageWithImageName:(NSString *)imageName waterStainNSString: (NSString *)waterStr CGSize:(CGSize)maxSize font: (UIFont *)textFont padding: (CGFloat)padding;

@end

UIImage+WaterStain.m

//
//  UIImage+WaterStain.m
//  Quartz2D练习 -- 绘制水印的image分类
//
//  Created by apple on 14-6-10.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "UIImage+WaterStain.h"
#import "NSString+Extension.h"

@implementation UIImage (WaterStain)

+ (UIImage *)imageWithImageName:(NSString *)imageName waterStainIconName:(NSString *)iconName
{
    UIImage *image = [UIImage imageNamed:imageName];
    
    CGFloat imageX = image.size.width;
    CGFloat imageY = image.size.height;
    
    // 创建bigmap图形上下文
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
    
    // 绘制图片
    [image drawInRect:CGRectMake(0, 0, imageX, imageY)];
    
    CGFloat margin = 10;
    
    // 绘制图片水印
    UIImage *icon = [UIImage imageNamed:iconName];
    
    CGFloat iconX = imageX - icon.size.width - margin;
    CGFloat iconY = margin;
    CGFloat iconW = icon.size.width;
    CGFloat iconH = icon.size.height;
    // 绘制水印图片
    [icon drawInRect:CGRectMake(iconX, iconY, iconW, iconH)];
    
    // 获取绘制的图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    return newImage;
}

+ (UIImage *)imageWithImageName:(NSString *)imageName waterStainNSString:(NSString *)waterStr CGSize:(CGSize)maxSize font:(UIFont *)textFont padding:(CGFloat)padding
{
    UIImage *image = [UIImage imageNamed:imageName];
    
    CGFloat imageX = image.size.width;
    CGFloat imageY = image.size.height;
    
    // 创建bigmap图形上下文
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
    
    // 绘制图片
    [image drawInRect:CGRectMake(0, 0, imageX, imageY)];
    
    // 绘制文字水印
    NSString *str = waterStr;
    // 获取文字的尺寸
    CGSize size = [str sizeWithFont:textFont andMaxSize:maxSize];
    // 获取文字位置
    CGFloat strX = imageX - size.width - padding;
    CGFloat strY = imageY - size.height - padding;
    
    NSMutableDictionary *dicts = [NSMutableDictionary dictionary];
    dicts[NSForegroundColorAttributeName] = [UIColor orangeColor];
    dicts[NSFontAttributeName] = textFont;
    // 绘制水印文字
    [str drawAtPoint:CGPointMake(strX, strY) withAttributes:dicts];
    
    // 获取绘制的图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    return newImage;
}

@end

NSString+Extension.h

#import <Foundation/Foundation.h>

@interface NSString (Extension)

- (CGSize)sizeWithFont:(UIFont *)font andMaxSize: (CGSize)maxSize;

@end

NSString+Extension.m

#import "NSString+Extension.h"

@implementation NSString (Extension)

- (CGSize)sizeWithFont:(UIFont *)font andMaxSize:(CGSize)maxSize
{
    NSDictionary *dict = @{NSFontAttributeName : font};
    CGSize size = [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil].size;
    return size;
}

@end