How to draw a dynamic circle in Objective-C

Asked Dec 30 '14 at 12:24

Active Dec 30 '14 at 13:10

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How to draw a dynamic circle in Objective-C

I have to draw 2 circles first outer circle radius is fixed shown in figure filled with green Color (A).

The other circle is dynamic based on some radius(B).

How can I achieve this.

enter image description here

asked Dec 30 '14 at 12:24

Vineesh TP

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http://stackoverflow.com/questions/15249675/dynamically-redraw-re-sized-circle-in-iphone?lq=1 – Suhit Patil Dec 30 '14 at 12:37
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This is like 2 maybe 4 lines of code. There are built in Apis to draw circles. Didn't you think to try them first? – Fogmeister Dec 30 '14 at 13:19

2 Answers2

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Subclass an UIView and then override its drawRect method. Inside it use some NSBezierPaths and NSColor settings to make your drawings.

drawRect: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/drawRect:

Cocoa drawings https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40003290-CH201-SW1

Bezier paths https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Paths/Paths.html

Colors https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Color/Color.html#//apple_ref/doc/uid/TP40003290-CH205-BAJDFIFE

answered Dec 30 '14 at 13:10

Jean-Baptiste Yunès

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This might help you,

Download sketch from apple. http://developer.apple.com/library/mac/#samplecode/Sketch

stackoverflow link

edited May 23 '17 at 12:20

Community

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answered Dec 30 '14 at 12:29

Yuyutsu

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