IOS UIImage picture watermark, picture clipping, screenshot, background tiling

Image Watermark function

1 #import "Uiimage+zr.h"2 3 @implementationUIImage (ZR)4+ (Instancetype) WATERIMAGEWITHBG: (NSString *) BG Logo: (NSString *) Logo5 {6UIImage *bgimage =[UIImage IMAGENAMED:BG];7     8     //1. Create a bitmap-based context (open a bitmap-based context)9Uigraphicsbeginimagecontextwithoptions (Bgimage.size, NO,0.0);Ten      One     //2. Painting Background A[Bgimage Drawinrect:cgrectmake (0,0, BgImage.size.width, BgImage.size.height)]; -      -     //3. Draw the watermark in the lower right corner theUIImage *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; A [Waterimage drawinrect:cgrectmake (Waterx, watery, waterw, Waterh)]; at      -     //4. Get the finished UIImage object from the context -UIImage *newimage =Uigraphicsgetimagefromcurrentimagecontext (); -      -     //5. End Context - Uigraphicsendimagecontext (); in      -     returnNewImage; to } + @end

Picture clipping

1 #import "Uiimage+zr.h"2 3 @implementationUIImage (ZR)4+ (Instancetype) Circleimagewithname: (NSString *) name BorderWidth: (cgfloat) borderWidth bordercolor: (Uicolor *) bordercolor5 {6     //1. Loading the original7UIImage *oldimage =[UIImage imagenamed:name];8     9     //2. Open ContextTenCGFloat Imagew = OldImage.size.width +2*BorderWidth; OneCGFloat Imageh = OldImage.size.height +2*BorderWidth; ACgsize imageSize =Cgsizemake (Imagew, Imageh); -Uigraphicsbeginimagecontextwithoptions (ImageSize, NO,0.0); -      the     //3. Get the current context -Cgcontextref CTX =Uigraphicsgetcurrentcontext (); -      -     //4. Draw the border (great circle) +[BorderColorSet]; -CGFloat Bigradius = Imagew *0.5;//Circle Radius +CGFloat CenterX = Bigradius;//Center ACGFloat centery =Bigradius; atCgcontextaddarc (CTX, CenterX, CenterY, Bigradius,0, M_PI *2,0); -Cgcontextfillpath (CTX);//Draw a circle -      -     //5. Small Circle -CGFloat Smallradius = Bigradius-BorderWidth; -Cgcontextaddarc (CTX, CenterX, CenterY, Smallradius,0, M_PI *2,0); in     //cropping (the things that are drawn later will be affected by clipping) - Cgcontextclip (CTX); to      +     //6. Drawing - [Oldimage drawinrect:cgrectmake (BorderWidth, BorderWidth, OldImage.size.width, OldImage.size.height)]; the      *     //7. Take a picture $UIImage *newimage =Uigraphicsgetimagefromcurrentimagecontext ();Panax Notoginseng      -     //8. End Context the Uigraphicsendimagecontext (); +      A     returnNewImage; the } + @end

Screen

1 #import "Uiimage+zr.h"2 3 @implementationUIImage (ZR)4+ (Instancetype) Capturewithview: (UIView *) View5 {6     //1. Open Context7Uigraphicsbeginimagecontextwithoptions (View.frame.size, NO,0.0);8     9     //2. Render the layer of the Controller view to the contextTen [View.layer Renderincontext:uigraphicsgetcurrentcontext ()]; One      A     //3. Remove the image -UIImage *newimage =Uigraphicsgetimagefromcurrentimagecontext (); -      the     //4. End Context - Uigraphicsendimagecontext (); -      -     returnNewImage; + } - @end

Background stretch

1- (void) IMAGEBG2 {3UIImage *oldimage = [UIImage imagenamed:@"Me"];4     5Uigraphicsbeginimagecontextwithoptions (Self.view.frame.size, NO,0.0);6 [Oldimage drawInRect:self.view.bounds];7UIImage *newimage =Uigraphicsgetimagefromcurrentimagecontext ();8 Uigraphicsendimagecontext ();9     TenSelf.view.backgroundColor =[Uicolor colorwithpatternimage:newimage]; One}

Background tile

1- (void) Viewdidload2 {3 [Super Viewdidload];4     5 //Self.view.backgroundColor = [Uicolor redcolor];6     7     //1. Create a row of background images8CGFloat ROWW =Self.view.frame.size.width;9 //cgfloat rowh = +;TenCGFloat ROWH = -; OneUigraphicsbeginimagecontextwithoptions (Cgsizemake (ROWW, ROWH), NO,0.0); A      -Cgcontextref CTX =Uigraphicsgetcurrentcontext (); -     //Draw a rectangular box the[[Uicolor Redcolor]Set]; -Cgcontextaddrect (CTX, CGRectMake (0,0, ROWW, ROWH)); - Cgcontextfillpath (CTX); -      +     //2. Draw the line -[[Uicolor Greencolor]Set]; +CGFloat linewidth =2; A cgcontextsetlinewidth (CTX, linewidth); atCGFloat Dividerx =0; -CGFloat dividery = rowh-linewidth; - Cgcontextmovetopoint (CTX, Dividerx, dividery); -Cgcontextaddlinetopoint (CTX, ROWW-Dividerx, dividery); - Cgcontextstrokepath (CTX); -      in     //3. Take a picture -UIImage *newimage =Uigraphicsgetimagefromcurrentimagecontext (); to      +     //4. End Context - Uigraphicsendimagecontext (); the      *     //5. Set as Background $Self.textView.backgroundColor =[Uicolor colorwithpatternimage:newimage];Panax Notoginseng}

IOS UIImage picture watermark, picture clipping, screen, background tiling