ios - Unable to simultaneously satisfy constraints after updating height -


i have cell 2 image views: cell

constraints small image view: small

constraints big one: big

constraints button: button

the big image view has "scale fill" content mode.

i don't know size of image before load sdwebimage, i've created constant height constraint , outlet in code.

when image loaded, i'm changing height constraint's constant keep image's aspect:

imageiv.sd_setimage(with: feedad.getimageurl(), completed: { (image: uiimage?, error: error?, cachetype: sdimagecachetype!, imageurl: url?) in                 if image != nil {                     let ratio = image!.size.height / image!.size.width                     self.imageheightconstraint.constant = self.imageiv.frame.width * ratio                     self.updateconstraints()                 } else {                     print("image == nil!")                 }                  if self.imageviewloadedcallback != nil {                     self.imageviewloadedcallback!()                 }             })

and see following:

2017-01-13 00:21:10.387862 dotato[1541:503878] [layoutconstraints] unable simultaneously satisfy constraints.     @ least 1 of constraints in following list 1 don't want.      try this:          (1) @ each constraint , try figure out don't expect;          (2) find code added unwanted constraint or constraints , fix it.  (     "<nslayoutconstraint:0x17008df70 uiimageview:0x102d39000.height == 48>",     "<nslayoutconstraint:0x174098bf0 uiimageview:0x102e59e40.height == 228.667>",     "<nslayoutconstraint:0x17409bc10 uiimageview:0x102d39000.top == uitableviewcellcontentview:0x102d4bae0.top + 8>",     "<nslayoutconstraint:0x174098010 uiimageview:0x102e59e40.top == uiimageview:0x102d39000.bottom + 8>",     "<nslayoutconstraint:0x17409aae0 uibutton:0x102e6c600.top == uiimageview:0x102e59e40.bottom + 16>",     "<nslayoutconstraint:0x17409aa40 uitableviewcellcontentview:0x102d4bae0.bottom == uibutton:0x102e6c600.bottom + 8>",     "<nslayoutconstraint:0x17009be40 uitableviewcellcontentview:0x102d4bae0.height == 293>" )  attempt recover breaking constraint  <nslayoutconstraint:0x174098bf0 uiimageview:0x102e59e40.height == 228.667>

the cell height not updated, view height-cutted. when scroll table view down unless cell becomes out of screen , scroll it, resizes correctly.

so, have 2 questions:

  1. how resolve error?
  2. how make cell adjust it's height correctly?


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