CODEWITHSUNDEEP
iosobjective-cuibuttoncgcolor
UdayM
UdayM

Reputation: 1783

Set border for UIButton

I am trying to keep border for UIButton.If i use the following code it's working.

Case:1

[[_myButton layer] setBorderWidth:1.0f];
[[_myButton layer] setBorderColor:[UIColor lightGrayColor].CGColor];

But before when i wrote:

self.baseTypeButton.layer.borderWidth=2.0f;
self.myButton.layer.borderColor=[UIColor lightGrayColor];

XCode proposed me to do

enter image description here

Now my code changed,but i failed to set border in this case:

Case:2

_myButton.layer.borderWidth=2.0f;
_myButton.layer.borderColor=(__bridge CGColorRef _Nullable)([UIColor lightGrayColor]);

I am not using Auto-layout. Can anybody explain what is the difference between case-1 and case-2. Why case-2 wont work.

Upvotes: 2

Views: 5095

Answers (3)

Monika Patel
Monika Patel

Reputation: 2375

Use this code 

_myButton.layer.borderWidth=2.0f;
_myButton.layer.borderColor=[UIColor lightGrayColor].CGColor;

Upvotes: 0

Satachito
Satachito

Reputation: 5888

layer.borderColor must be CGColor, so code below will work.

_myButton.layer.borderWidth=2.0f;
_myButton.layer.borderColor=[ UIColor lightGrayColor ].CGColor;

Your code

   [UIColor lightGrayColor]

returns a UIColor instance, not a CGColor instance. And UIColor can't bridge to CGColor, so your cast

(__bridge CGColorRef _Nullable)

returns unexpected result.

You can see strange result using this code

NSLog( @"%@", (__bridge CGColorRef _Nullable)([UIColor lightGrayColor]) );

returning below. ( Xcode 7.3 )

2016-04-06 15:30:51.415 36442877[8570:2643221] UIDeviceWhiteColorSpace 0.666667 1

If you give borderColor CGColor instance directory, you don't need casting.

Upvotes: 7

Ronak Chaniyara
Ronak Chaniyara

Reputation: 5436

If you are using ARC in your project than,

_myButton.layer.borderWidth=2.0f;
_myButton.layer.borderColor=(__bridge CGColorRef _Nullable)([UIColor lightGrayColor]);

Will not work, because __bridge CGColorRef _Nullable will autorelease reference.the moment CFRelease() is called the object is gone and points to nothing.

And

[[_myButton layer] setBorderWidth:1.0f];
[[_myButton layer] setBorderColor:[UIColor lightGrayColor].CGColor];

will work as expected.

For more information check:

ARC and bridged cast

Upvotes: 1

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