Ios ui texture blurry

I have tried changing pvrtc compression to 4 and nothing improved,the ui texture just looks more blurry on any ios devices than which in the editor or in mobile previewer or on ATC android devices.I have also tried set mobilecontentfactor to 0 or 2,still does nothing…Even if I changed to Nomipmaps and turn on TemporalAA,still disappointing…I really don’t know why it looks blurry on ios than android devices…Please help me!Thanks a lot!

I need to change the compression setting to Vectordisplacementmap and that’s works!