Crop pictures, screenshots, save to albums, watermarks

--- crop a circular picture

- draw a round head with a border

-(void) Touchesbegan: (nsset*) touches withevent: (uievent*) event

{

//-1. Get Pictures

uiimage* image = [UIImage imagenamed:@ "Me"];

// -2.margin

CGFloat margin = ten;

//-3. Context Size

Cgsize size = Cgsizemake (Image.size.width + 2 * margin, image.size.height + 2 * margin);

//-4. Open Picture Context

Uigraphicsbeginimagecontextwithoptions (Size, NO, 0);

//-5. Get the graphics context

Cgcontextref CTX = Uigraphicsgetcurrentcontext ();

//-6. Center Center

Cgpoint arccenter = Cgpointmake (size.width * 0.5, size.height * 0.5);

//-7. radius

CGFloat radius = image.size.width * 0.5 + margin * 0.5;

//-8. Draw Border

Cgcontextaddarc (CTX, arccenter.x, arccenter.y, radius, 0, 2 * m_pi, 1);

//-9. Set width

Cgcontextsetlinewidth (CTX, margin);

//-10. Render Border

Cgcontextstrokepath (CTX);

//-11. Draw the area you want to crop

Cgcontextaddarc (CTX, arccenter.x, Arccenter.y, Image.size.width * 0.5, 0, 2 * m_pi, 1< c15>);

//-12. cropping

Cgcontextclip (CTX);

//-13. Picture Portrait

[Image drawatpoint:cgpointmake (margin, margin)];

//-14. gets the current image

Image = Uigraphicsgetimagefromcurrentimagecontext ();

//-15. Close Picture Context

Uigraphicsendimagecontext ();

//-16. Assign Value

self. imageview.image = image;

}

Save to album

First : picture

the second third listener Note : @selector can not write casually using the " comments " method

Fourth : It can be used as a tag to use parameters in the listening method will be passed in

Uiimagewritetosavedphotosalbum (NewImage, self, @selector(image:didfinishsavingwitherror: ContextInfo:), @ "hello1111");

--- screen

to manipulate the Layer property of a controller's view

[self. View.layer Renderincontext:ctx];

-(void) Touchesbegan: (nsset*) touches withevent: (uievent*) event

{

// Open Picture context

Uigraphicsbeginimagecontextwithoptions (selfview.bounds.size, NO, 0);

// Gets the current picture context

Cgcontextref CTX = Uigraphicsgetcurrentcontext ();

//

[self. View.layer Renderincontext:ctx];

// take pictures

uiimage* image = Uigraphicsgetimagefromcurrentimagecontext ();

// off

Uigraphicsendimagecontext ();

// save to album

Uiimagewritetosavedphotosalbum (image, nil, nil, nil);

}

//0. Watermark

-(void) Touchesbegan: (nsset*) touches withevent: (uievent*) event

{

//Water printing

// Get a picture that requires a watermark

uiimage* image = [UIImage imagenamed:@ "HHKB"];

// Open the context of the picture type

Uigraphicsbeginimagecontextwithoptions (image.size, NO, 0);

// draw a picture of the watermark to the context

[Image Drawatpoint:cgpointzero];

// text watermark content

nsstring* str = @ " Preach Wisdom Podcast IOS";

// draw text at the same time set some parameters of the text

[Str drawatpoint:cgpointmake ( withattributes):@{ nsfontattributename: [Uifont Systemfontofsize:+], nsforegroundcolorattributename: [Uicolor whitecolor] };

// picture watermark content

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

// picture watermark

[Logo drawatpoint:cgpointmake (Image.size.width- $ - image.size.height - )];

// get pictures

Image = Uigraphicsgetimagefromcurrentimagecontext ();

// Close context

Uigraphicsendimagecontext ();

// save to album

Uiimagewritetosavedphotosalbum (image, nil, nil, nil);

}

Crop pictures, save to albums, Watermark