Image watermark (personal signature on Weibo image)

-(void) viewdidload

{

[Super Viewdidload];

1. Return watermark Image

UIImage *newimage = [UIImage waterimagewithbg:@ "Scene" logo:@ "logo"];

2. Show pictures

Self.iconView.image = NewImage;

}

-(void) Testwater

{

UIImage *bgimage = [UIImage imagenamed:@ "scene"];

Ober: Based on bitmap (bitmap), all things need to be drawn to a new picture up

1. Create a bitmap-based context (open a bitmap-based context)

Size: The dimensions of the new picture

Opaque:yes: Opaque, no: transparent

This line of code is followed by a common new bitmap, the new UIImage object.

Uigraphicsbeginimagecontextwithoptions (Bgimage.size, NO, 0.0);

2. Painting background

[Bgimage drawinrect:cgrectmake (0, 0, BgImage.size.width, bgImage.size.height)];

3. Draw the watermark in the lower right corner

UIImage *waterimage = [UIImage imagenamed:@ "logo"];

CGFloat scale = 0.2;

CGFloat margin = 5;

CGFloat WATERW = waterImage.size.width * scale;

CGFloat waterh = waterImage.size.height * scale;

CGFloat Waterx = Bgimage.size.width-waterw-margin;

CGFloat watery = bgimage.size.height-waterh-margin;

[Waterimage Drawinrect:cgrectmake (Waterx, watery, waterw, Waterh)];

4. Get the finished UIImage object from the context

UIImage *newimage = Uigraphicsgetimagefromcurrentimagecontext ();

5. End Context

Uigraphicsendimagecontext ();

6. Show to Uiimageview

Self.iconView.image = NewImage;

7. Compressing the image object to binary data in PNG format

NSData *data = uiimagepngrepresentation (newimage);

UIImageJPEGRepresentation (< #UIImage *image#>, < #CGFloat compressionquality#>)

8. Writing files

NSString *path = [[Nssearchpathfordirectoriesindomains (NSDocumentDirectory, Nsuserdomainmask, YES) LastObject] stringbyappendingpathcomponent:@ "New.png"];

[Data Writetofile:path Atomically:yes];

}

Add a category to image

/**

* Water Stamp

* Return a picture with a watermark

* @param BG Background image

* @param watermark image in the bottom right corner of logo

*/

+ (Instancetype) WATERIMAGEWITHBG: (NSString *) BG Logo: (NSString *) logo

{

UIImage *bgimage = [UIImage IMAGENAMED:BG];

1. Create a bitmap-based context (open a bitmap-based context)

Uigraphicsbeginimagecontextwithoptions (Bgimage.size, NO, 0.0);

2. Painting background

[Bgimage drawinrect:cgrectmake (0, 0, BgImage.size.width, bgImage.size.height)];

3. Draw the watermark in the lower right corner

UIImage *waterimage = [UIImage Imagenamed:logo];

CGFloat scale = 0.2;

CGFloat margin = 5;

CGFloat WATERW = waterImage.size.width * scale;

CGFloat waterh = waterImage.size.height * scale;

CGFloat Waterx = Bgimage.size.width-waterw-margin;

CGFloat watery = bgimage.size.height-waterh-margin;

[Waterimage Drawinrect:cgrectmake (Waterx, watery, waterw, Waterh)];

4. Get the finished UIImage object from the context

UIImage *newimage = Uigraphicsgetimagefromcurrentimagecontext ();

5. End Context

Uigraphicsendimagecontext ();

return newimage;

}

Image watermark (personal signature on Weibo image)