ios - CALayer Troubles when loading an image from a UIImagePicker -

-

i have uiviewcontroller uiimageview (imageview), , i'm defining several layers nested in imageview follows in viewdidload: 

//container layer - top layer calayer *containerlayer = [calayer layer]; containerlayer.opacity = 0; containerlayer.bounds = [self.imageview.layer frame];  // holder layer calayer *holderlayer = [calayer layer]; holderlayer.opacity = 0; holderlayer.bounds = self.imageview.bounds;  // hierarchy layers [containerlayer setvalue:holderlayer forkey:@"__holderlayer"]; [containerlayer addsublayer:holderlayer];  [self.imageview.layer addsublayer:containerlayer];

i have following code works when loading image uiimagepicker :

    uiimage *image = [info objectforkey:uiimagepickercontrolleroriginalimage];     uiimageview *newimgview = [[uiimageview alloc] initwithframe:self.imageview.frame];      cgrect frame = self.imageview.frame;      newimgview.image = image;     frame.origin = cgpointmake(0, 0);     newimgview.layer.frame = frame;     newimgview.layer.opacity = .9;     newimgview.layer.contentsgravity = kcagravityresizeaspectfill;      calayer * containerlayer = self.imageview.layer.sublayers[0];      if (containerlayer != nil)     {          [containerlayer setvalue:newimgview.layer forkey:@"__imagelayer"];           calayer * holderlayer = [containerlayer valueforkey:@"__holderlayer"];         if (holderlayer != nil)         {             //!!!!!line below doesn't work!!!             //[holderlayer addsublayer:newimgview.layer];              //line below works!             [self.imageview.layer addsublayer:newimgview.layer];         }        }     [self.imageview setneedsdisplay];     [self checkandprintlayers];

so first nested layer containerlayer, holderlayer, , i'm expecting add various images sublayers holderlayer , manipulate it. however, calling 

  [holderlayer addsublayer:newimgview.layer];

doesn't work; imageview stays blank. however, calling 

[self.imageview.layer addsublayer:newimgview.layer];

and adding sublayer top layer works dandy. missing obvious here? love suggestions. thanks.

because

holderlayer , containerlayer transparent (holderlayer.opacity = 0 / containerlayer.opacity = 0),

make it,

 //container layer - top layer calayer *containerlayer = [calayer layer]; containerlayer.opacity = 1.0; containerlayer.bounds = [self.imageview.layer frame];  // holder layer calayer *holderlayer = [calayer layer]; holderlayer.opacity = 1.0; holderlayer.bounds = self.imageview.bounds;

Comments

Post a Comment

Popular posts from this blog

java - Jmockit String final length method mocking Issue -

-
using jmockit 1.2 jar, trying mock string's length method getting unexpected invocation exception: failed: test java.lang.illegalstateexception: missing invocation mocked type @ point; please make sure such invocations appear after declaration of suitable mock field or parameter @ stringdemo.testa$1.<init>(testa.java:17) @ stringdemo.testa.test(testa.java:13) i using testng: @test public void test() throws exception { new expectations() { @mocked("length") string astring; { astring.length(); result = 2; } }; system.out.println(a.showa("test")); } } actual class a: public class { public static int showa(string str){ int a= str.length(); return a; } } this wrong way of recording expected results. shouldn't mock , record string's length() method, record showa() instead. here solution @suppresswarnings("unused...
Read more

What is the difference between data design and data model(ERD) -

-
i have google question , find answer in day. know, data design many many table have list column,and mark pk , fk. why er-diagram have find this? data design process of designing database. main output of data design detailed logical data model of database. some people data design includes of needed logical , physical design choices , physical storage parameters needed generate design in data definition language. technically, database analysis, database analysts (dbas) trained do. while person can both data design , database analysis, these 2 different tasks. data design models data. database analysis takes model , applies 1 or more database engines (relational, hierarchical, nosql). a logical data model 1 of main outputs of data design. data model represented entity relationship diagram, or er diagram.
Read more

ios - Can NSManagedObject conform to NSCoding -

-
i need transfer single object across device. right converting nsmanagedobject dictionary , archiving , sending nsdata. upon receiving unarchiving it. transfer nsmanagedobject archiving , unarchiving instead of creating intermediate data object. @interface test : nsmanagedobject<nscoding> @property (nonatomic, retain) nsstring * title; @end @implementation test @dynamic title; - (id)initwithcoder:(nscoder *)coder { self = [super init]; if (self) { self.title = [coder decodeobjectforkey:@"title"]; //<crash } return self; } - (void)encodewithcoder:(nscoder *)coder { [coder encodeobject:self.title forkey:@"title"]; } @end nsdata *archivedobjects = [nskeyedarchiver archiveddatawithrootobject:testobj]; nsdata *objectsdata = archivedobjects; if ([objectsdata length] > 0) { nsarray *objects = [nskeyedunarchiver unarchiveobjectwithdata:objectsdata]; } the problem above code is. crashes @ self.title in initwithcoder sa...
Read more