Objective-C class type error -

i have view created following:

class myclass = nsclassfromstring(classname);  uiview *myview = [[myclass alloc] initwithframe:..]; 

the above works, hoping know if possible replace uiview , create instance this:

myclass *myview = [[myclass alloc] initwithframe:..]; 

? gives error:

use of undeclared identifier myview

why can use this? , how can use way?

so tried:

const char *class = [myclass utf8string]; class myclass = objc_allocateclasspair([uiview class], class, 0); myclass *myview = [[myclass alloc] initwithframe:..]; 

but doesn't work. doesn't give above warning when subsequently do:

myview.backgroundcolor = ....; 

use of undeclared identifier myview

how can able use class type dynamically? , difference between:

nsclassfromstring(classname); 

and:

objc_allocateclasspair 

?

use

class myclass = nsclassfromstring(classname); id myview = [[myclass alloc] initwithframe:..]; [myview setbackgroundcolor:[uicolor redcolor]]; 

---

but compile if try to

[myview addobject:...]; 

and crash.