ios UIView animateWithDuration 学习

#pragma mark -- UIView animateWithDuration
- (void)initTestBtn
{
_testBtn = [[UIButton alloc]initWithFrame:CGRectMake(15, 230, kDEVICEWIDTH-30, 45)];
_testBtn.backgroundColor = [UIColor grayColor];
[_testBtn addTarget:self action:@selector(commitClick) forControlEvents:UIControlEventTouchUpInside];
[_testBtn setTitle:@"提交" forState:UIControlStateNormal];
_testBtn.titleLabel.textColor = [UIColor whiteColor];
_testBtn.layer.cornerRadius = 4;
[self.view addSubview:_testBtn];

//    _testView = [[UIView alloc]initWithFrame:CGRectMake(15, 300, kDEVICEWIDTH-30, 45)];
//    _testView.backgroundColor = [UIColor grayColor];
//
//    [self.view addSubview:_testView];

// [_testView addSubview:_testBtn];
}

- (void)testAnimateWithDuration
{
/*typeof(self) 是获取到self的类型,这样定义出的weakSelf就是和self一个类型的, 加上__weak是建立一个若引用,整句就是给self定义了一个若引用性质的替身;
这个一般用在使用block时会用到,因为block会copy它内部的变量,可能会造成引用循环,使用__weak性质的self替代self,可以切断block对self的引用,避免循环引用*/
__weak __typeof(self) weakSelf = self;

CGRect _tempCG = _testBtn.frame;

_tempCG.origin.y = 360;

[UIView animateWithDuration:1.5
animations:^{

//_testBtn.frame = CGRectMake(15, kDEVICEHEIGHT, kDEVICEWIDTH-30, 45);

_testBtn.frame = _tempCG;
}
completion:^(BOOL finished)
{
_testBtn.hidden = YES;
}];
}