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By default, when animating a check out by using a shadow, the shadow is redrawn through Every single phase on the animation. You can improve animations with shadows by rasterizing the layer in the perspective While using the shadow.

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Main Data is not really thread Risk-free. The solution for that reason proposed by Apple is to work with thread containment which involves developing a individually-managed object context for accessing Main Information objects on Just about every thread and having a solitary shared persistent keep coordinator.

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. When an object is in use by another object it’s keep depend goes up; when It isn't getting used by any objects, its retain depend reverts to zero.

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They can also be perfectly conscious of the different implementation options readily available, including the tradeoffs that come with these unique options with regards to efficiency, scalability, overall performance, and maintainability. The issues that adhere to support evaluate this dimension of the candidate’s abilities.

If you only require a thumbnail size image, keep a smaller sized dimensions locally. Equally, utilize any intricate transforms towards the impression ahead of time if at all possible. Alternatively, carry out the required functions around the picture off the primary thread after which refresh the cell when the image is ready for Exhibit.

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exc_bad_access mistakes are a common prevalence which can frustrate starter iOS developers due to the not enough handy debugging information and facts that they provide. They frequently happen when seeking to entry an object which was under no circumstances initialized or has now been produced.

a way (from its superclass) by sending respondsToSelector: to the thing utilizing the super key word. Sending respondsToSelector: to Tremendous is equivalent to sending it to self. As an alternative, you'll want to use the instancesRespondToSelector: technique on the thing’s superclass, by way of example: