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I have a view and I added a observer like this: 

_aView = [UIView new];
[_aView addObserver:self forKeyPath:@"frame" options:NSKeyValueObservingOptionNew context:nil];
_aView.frame = CGRectMake(100, 100, 100, 100);

In the observer method I get the new value :

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    if ([keyPath isEqualToString:@"frame"]) {
            NSLog(@"%@", change[@"new"]);
    }
  }

The log is NSRect: {{100, 100}, {100, 100}}. The question is that I got the value type is NSRect, how to convert it to CGRect?

In the UIKit library have no type named NSRect

Cong Tran
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ZeroChow
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2 Answers2

2

Convert NSRect to CGRect by:

CGRect NSRectToCGRect(NSRect nsrect);

Note: NSRect doesn't exist in iOS, the above works in only in OSX.

For iOS: CGRect rect = [change[@"new"] CGRectValue]; //copied from Rob's answer

Read Rect Conversion in iOS.

Anoop Vaidya
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2

NSRect and CGRect are the same on OS X. You will find this in NSGeometry.h in the OS X SDK:

typedef CGRect NSRect;

On iOS, NSRect doesn't exist, but the formatting function is the same on both platforms and it prints NSRect regardless. You can get the CGRect value like this:

CGRect rect = [change[@"new"] CGRectValue];
rob mayoff
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  • Thanks for correcting me, my answer is not correct, but got +1. I was not aware that NSRectToCGRect is missing in iOS – Anoop Vaidya Dec 30 '15 at 07:55