uiview-animatedproperty's Introduction

UIView+AnimatedProperty

This extension to UIView block animations allows you to implement your own animated properties of UIView subclasses.

The main part is category on UIView that swizzles animation methods to extend them. Extended methods store duration, delay and options of the current animation to globally accessible variable (via accessor +currentAnimation). Then in setter of your animated property you check whether you are called in context of animation block and can alter the behavior (usually by running CAAnimation).

In addition, it supports nested animations with proper overriding of inherited duration and curve. Also it provides easy contructor for CABasicAnimation and accessors for animation options.

Example

Your UIView subclass with custom animated property:

@implementation ANPCornerView

@dynamic cornerRadius;

- (CGFloat)cornerRadius {
    return self.layer.cornerRadius;
}

- (void)setCornerRadius:(CGFloat)cornerRadius {
    if ([UIView currentAnimation]) {
        [[UIView currentAnimation] animateLayer:self.layer keyPath:@"cornerRadius" toValue:@(cornerRadius)];
    }
    else {
        self.layer.cornerRadius = cornerRadius;
    }
}

This is how you use it:

[UIView animateWithDuration:5 animations:^{
    myView.cornerRadius = 50;
}];

For more detailed example, see the project.

Version 0.4.0

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