iOS uiimage Zoom
Last Update:2015-10-10
Source: Internet
Author: User
<span id="Label3"></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><span style="word-wrap: normal; word-break: normal; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">To scale uiimage to a specified size size:</span><br></p></p><p><p>-(UIImage *) scaletosize: (UIImage *) img size: (cgsize) size{</p></p><p><p>Create a bitmap context</p></p><p><p>and set it to the context that is currently being used</p></p><p><p>Uigraphicsbeginimagecontext (size);</p></p><p><p>Draw a picture that changes size</p></p><p><p>[img drawinrect:cgrectmake (0, 0, size.width, size.height)];</p></p><p><p>Create a resized picture from the current context</p></p><p><p>uiimage* scaledimage = Uigraphicsgetimagefromcurrentimagecontext ();</p></p><p><p>Make the current context out of the stack</p></p><p><p>Uigraphicsendimagecontext ();</p></p><p><p>Returns the new resized image</p></p><p><p>Return scaledimage;</p></p><p><p>}</p></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><span style="word-wrap: normal; word-break: normal; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><br></span></p></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><span style="word-wrap: normal; word-break: normal; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><br></span></p></p><p><p>Compress the returned picture according to the size of the picture</p></p><p><p>02+ (UIImage *) fitsmallimage: (UIImage *) image</p></p><p><p>239</p></p><p><p>if (nil = = Image)</p></p><p><p>05 {</p></p><p><p>Return nil;</p></p><p><p>07}</p></p><p><p>If (image.size.width</p></p><p><p>09 {</p></p><p><p>Ten return image;</p></p><p><p>11}</p></p><p><p>Cgsize size = [dsmdataconvert fitsize:image.size];</p></p><p><p>Uigraphicsbeginimagecontext (size);</p></p><p><p>CGRect rect = cgrectmake (0, 0, size.width, size.height);</p></p><p><p>[image drawinrect:rect];</p></p><p><p>UIImage *newing = Uigraphicsgetimagefromcurrentimagecontext ();</p></p><p><p>Uigraphicsendimagecontext ();</p></p><p><p>Return newing;</p></p><p><p>19}</p></p><p><p>+ (cgsize) fitsize: (cgsize) thissize</p></p><p><p>229</p></p><p><p>If (thissize.width = = 0 && thissize.height ==0)</p></p><p><p>Cgsizemake return (0, 0);</p></p><p><p>CGFloat Wscale = thissize.width/image_max_size_width;</p></p><p><p>CGFloat Hscale = thissize.height/image_max_size_geight;</p></p><p><p>CGFloat scale = (wscale>hscale)? wscale:hscale;</p></p><p><p>Cgsize newSize = Cgsizemake (thissize.width/scale, thissize.height/scale);</p></p><p><p>NewSize return;</p></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);">10}</p></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><br></p></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><br></p></p><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><p style="margin-top: 0px; margin-bottom: 5px; padding: 0px; border: 0px; list-style: none; word-wrap: normal; word-break: normal; line-height: 21px; color: rgb(73, 73, 73); font-family: simsun; font-size: 14px; white-space: normal; background-color: rgb(226, 226, 226);"><br></p></p><p><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">1. Use the following method to select the image you want to compress, and then output to sentencepic this uiimageview, you call this sentencepic sent to the server on the LINE. </span></span><br><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">2. Set the size of the compression scale is this: Imageframe. You are in the viewdidload, cgrect imageframe = sentencepic.frame; Where Sentencepic.frame is the size of the image you want to Intercept. Self-setting</span></span><br><br><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">-(void) imagepickercontroller: (uiimagepickercontroller *) picker didfinishpickingmediawithinfo: (NSDictionary *) info{</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"> </span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">UIImage *chosenimage = [info objectforkey:uiimagepickercontrollereditedimage];</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">UIImage *sharkenimage = shrinkimage (chosenimage, imageframe.size);</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">sentencepic.image = sharkenimage;</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"> </span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">[picker dismissmodalviewcontrolleranimated:yes];</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">}</span></span><br><br><br><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">static UIImage *shrinkimage (UIImage *original, cgsize Size) {</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgfloat scale = [uiscreen mainscreen].scale;</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb ();</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"> </span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgcontextref context = cgbitmapcontextcreate (nil, size.width *scale, size.height *scale, 8, 0, colorspace, kCGImag Ealphapremultipliedfirst);//null</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgcontextdrawimage (context, cgrectmake (0, 0, size.width *scale, size.height *scale), original. cgimage);</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgimageref shrunken = cgbitmapcontextcreateimage (context);</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">UIImage *final = [UIImage imagewithcgimage:shrunken];</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgcontextrelease (context);</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">cgimagerelease (shrunken);</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">return final;</span></span><br><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);"><span style="word-wrap: normal; word-break: normal; line-height: 21px; font-size: 14px; font-family: ‘Microsoft Yahei‘, simsun, Tahoma; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255);">}</span></span></p><p><p><br></p></p><p><p>iOS uiimage Zoom</p></p></span>
