IOS动画（动画调用方式）

IOS动画（动画调用方式）

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第一种：UIView 代码块调用

_demoView.frame = CGRectMake(0, SCREEN_HEIGHT/2-50, 50, 50);
[UIView animateWithDuration:1.0f animations:^{
    _demoView.frame = CGRectMake(SCREEN_WIDTH, SCREEN_HEIGHT/2-50, 50, 50);
} completion:^(BOOL finished) {
    _demoView.frame = CGRectMake(SCREEN_WIDTH/2-25, SCREEN_HEIGHT/2-50, 50, 50);
}];

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第二种：UIView [begin commit]模式

_demoView.frame = CGRectMake(0, SCREEN_HEIGHT/2-50, 50, 50);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0f];
_demoView.frame = CGRectMake(SCREEN_WIDTH, SCREEN_HEIGHT/2-50, 50, 50);
[UIView commitAnimations];

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第三种：使用Core Animation中的类

CABasicAnimation *anima = [CABasicAnimation animationWithKeyPath:@"position"];
anima.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, SCREEN_HEIGHT/2-75)];
anima.toValue = [NSValue valueWithCGPoint:CGPointMake(SCREEN_WIDTH, SCREEN_HEIGHT/2-75)];
anima.duration = 1.0f;
[_demoView.layer addAnimation:anima forKey:@"positionAnimation"];