- (void)customLayer
{
CAGradientLayer*layer = [CAGradientLayerlayer];
layer.frame=CGRectMake(0,0, [UIScreenmainScreen].bounds.size.width,200);
[self.view.layeraddSublayer:layer];
layer.colors=@[(__bridgeid)[[UIColorblackColor]colorWithAlphaComponent:0.8].CGColor,
(__bridgeid)[UIColorclearColor].CGColor,
];
[layersetStartPoint:CGPointMake(0.5,0)];
[layersetEndPoint:CGPointMake(0.5,1)];
}
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