Simulate System camera image Cropping

Simulate System camera image Cropping

The effect is as follows:

Source code:

//// Rootviewcontroller. M // scrollview // copyright (c) 2014 y. x. all rights reserved. // # import "rootviewcontroller. H "@ interface rootviewcontroller () <uiscrollviewdelegate> {bool tapped;} @ property (nonatomic, strong) uiscrollview * scrollview; @ property (nonatomic, strong) uiimageview * imageview; @ property (strong, nonatomic) uitapgesturerecognizer * tapgesture; @ end @ implementation rootviewcontroller- (Void) viewdidload {[Super viewdidload]; self. view. backgroundcolor = [uicolor blackcolor]; // scrollview {_ scrollview = [[uiscrollview alloc] initwithframe: cgrectmake (0, 0,200,200)]; [self. view addsubview: _ scrollview]; _ scrollview. center = self. view. center; _ scrollview. delegate = self; _ scrollview. layer. borderwidth = 2.f; _ scrollview. layer. bordercolor = [uicolor redcolor]. cgcolor; _ scrollview. l Ayer. maskstobounds = no; // the scroll bar _ scrollview is not displayed. showshorizontalscrollindicator = no; _ scrollview. showsverticalscrollindicator = no; _ scrollview. bounceszoom = yes; _ scrollview. minimumzoomscale = 1.f; _ scrollview. maximumzoomscale = 10.f; _ scrollview. contentmode = uiviewcontentmodescaleaspectfit;} // picture _ imageview = [[uiimageview alloc] initwithframe: cgrectmake (0, 0,200,200)]; _ imageview. image = [Uiimage imagenamed: @ "back"]; _ imageview. contentmode = uiviewcontentmodescaleaspectfit; [_ scrollview addsubview: _ imageview]; // gesture _ tapgesture = [[financialloc] initwithtarget: Self action: @ selector (taprecognized :)]; [_ scrollview addgesturerecognizer: _ tapgesture];}-(void) taprecognized :( ID) sender {If (! Tapped) {cgpoint tappoint = [self. tapgesture locationoftouch: 0 inview: Self. tapgesture. view]; cgrect zoomrect = [self zoomrectforscrollview: Self. scrollview withscale: 6.0f withcenter: tappoint]; [self. scrollview zoomtorect: zoomrect animated: Yes]; tapped = yes;} else {[self. scrollview setzoomscale: 1.0f animated: Yes]; tapped = no; }}- (cgrect) Duplicate :( uiscrollview *) scrollview withscale :( float) scale withcenter :( cgpoint) center {cgrect zoomrect; zoomrect. size. height = scrollview. frame. size. height/scale; zoomrect. size. width = scrollview. frame. size. width/scale; zoomrect. origin. X = center. x-(zoomrect. size. width/2.0); zoomrect. origin. y = center. y-(zoomrect. size. height/2.0); Return zoomrect;} # pragma mark-uiscrollview proxy method-(uiview *) viewforzoominginscrollview :( uiscrollview *) scrollview {return self. imageview;} @ end

Note the following:

You need to pass the Image view in the uiscrollview proxy method.

How can this be used? If you need to capture an image in a certain area, you will know what it is :)

 

 

 

 

 

 

 

 

 

 

 

Simulate System camera image Cropping