我正在寻找一种排队动画块的方法,并发生在这篇博客文章中: http://xibxor.com/2013/03/27/uiview-animation-without-nested-hell/
我无法让它发挥作用,但......如何安排这些元素的范围尚不清楚。另外,第18,25和32行的分号是什么?任何人都可以解释如何使用它吗?
编辑:这是从源代码复制的代码:
NSMutableArray* animationBlocks = [NSMutableArray new];
typedef void(^animationBlock)(BOOL);
// getNextAnimation
// removes the first block in the queue and returns it
animationBlock (^getNextAnimation)() = ^{
animationBlock block = animationBlocks.count ? (animationBlock)[animationBlocks objectAtIndex:0] : nil;
if (block){
[animationBlocks removeObjectAtIndex:0];
return block;
}else{
return ^(BOOL finished){};
}
};
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
[UIView animateWithDuration:1.0 animations:^{
//...animation code...
} completion: getNextAnimation()];
}];
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
[UIView animateWithDuration:1.0 animations:^{
//...animation code...
} completion: getNextAnimation()];
}];
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
[UIView animateWithDuration:1.0 animations:^{
//...animation code...
} completion: getNextAnimation()];
}];
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
NSLog(@"Multi-step Animation Complete!");
}];
// execute the first block in the queue
getNextAnimation()(YES);
答案 0 :(得分:2)
首先感谢分享这篇文章,这是一个好主意。这对我很有用:
在@interface
之外的.h中
。
typedef void(^animationBlock)(BOOL);
然后在你的.m(这里是- (void)viewDidLoad
内):
NSMutableArray* animationBlocks = [NSMutableArray new];
UILabel* labelTest = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
labelTest.text = @"Label Test";
[self.view addSubview:labelTest];
// getNextAnimation
// removes the first block in the queue and returns it
animationBlock (^getNextAnimation)() = ^{
animationBlock block = animationBlocks.count ? (animationBlock)[animationBlocks objectAtIndex:0] : nil;
if (block){
[animationBlocks removeObjectAtIndex:0];
return block;
}else{
return ^(BOOL finished){};
}
};
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
[UIView animateWithDuration:2.0 animations:^{
NSLog(@"1-step Animation Complete!");
labelTest.alpha = 0;
} completion: getNextAnimation()];
}];
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
[UIView animateWithDuration:2.0 animations:^{
labelTest.text = @"New text";
} completion: getNextAnimation()];
}];
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
[UIView animateWithDuration:2.0 animations:^{
labelTest.alpha = 1;
} completion: getNextAnimation()];
}];
//add a block to our queue
[animationBlocks addObject:^(BOOL finished){;
NSLog(@"Multi-step Animation Complete!");
}];
// execute the first block in the queue
getNextAnimation()(YES);
这是一个非常简单的动画但你需要它来测试它^^
希望这会有所帮助。