ios - How to change the frame of a view when a variable value changes? -


in viewcontroller, there few views. of view's frames depends on variable

cgfloat borderwidth

these views defined like

sec1 = [[mssectionview alloc]initwithframe:cgrectmake(self.borderwidth, self.borderwidth,self.frame.size.width/2-(self.borderwidth*3/2),self.frame.size.height/2 - (self.borderwidth*3/2) ) ];

i want change sec1's frame when change value of borderwidth class. how can that? know

[sec1 setframe:cgrectmake(self.borderwidth, self.borderwidth,self.frame.size.width/2-(self.borderwidth*3/2),self.frame.size.height/2 - (self.borderwidth*3/2) )];

will change frame there lots of uiviews. cant set frame of them in method.

you can implement this:

in mssectionview.m:

#import "mssectionview.h"  @implementation mssectionview  - (void)observevalueforkeypath:(nsstring *)keypath ofobject:(id)object change:(nsdictionary *)change context:(void *)context {     if ([keypath isequaltostring: @"borderwidth"])     {         cgfloat borderwidth = [(nsnumber*)[change objectforkey:nskeyvaluechangenewkey] floatvalue];         [self setframe: cgrectmake(borderwidth, borderwidth, self.frame.size.width/2 - (borderwidth * 3/2), self.frame.size.height/2 - (borderwidth * 3/2))];     }     else     {         [super observevalueforkeypath: keypath                              ofobject: object                                change: change                               context: context];     } }  @end

in viewcontroller, owns mssectionview subviews:

@implementation tsviewcontroller  @synthesize borderwidth;  - (void) viewdidload {     [super viewdidload];     // additional setup after loading view, typically nib.      nsarray* views = [self.view subviews];      (uiview* subview in views)     {         if ([subview iskindofclass: [mssectionview class]])         {             mssectionview* sectionview = (mssectionview*) subview;             [self addobserver: sectionview                    forkeypath: @"borderwidth"                       options: nskeyvalueobservingoptionnew | nskeyvalueobservingoptionold                       context: null];         }      } }

in viewcontroller.h:

@interface tsviewcontroller : uiviewcontroller {     cgfloat borderwidth; }  @property(nonatomic,readwrite,assign)cgfloat borderwidth;

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