objective c - Swizzle something that was retained -


hi don't understand retain well.

there code here:

mappicon = [[nsimage imagenamed:@"nsapplicationicon"] retain];

i trying swizzle whenever ask image name nsapplicationicon give custom icon. still see original icon come sometimes. think it's because of retain thing? right? possible clear retain? make swizzle works 100% of time instead of 80% :(

i read here retain wasnt able apply situation above: http://www.cocoawithlove.com/2010/06/assign-retain-copy-pitfalls-in-obj-c.html

very trying swizzle here: https://dxr.mozilla.org/mozilla-central/source/widget/cocoa/nsmacdocksupport.mm?offset=200#140


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