角落里的渐变

Question

我想创建一个右上角和左下角渐变的背景视图我该如何实现？

我有这个代码

  CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = self.bounds;
    gradient.colors = [NSArray arrayWithObjects: (id)[[UIColor whiteColor] CGColor],(id)[[UIColor blackColor] CGColor], nil];
    gradient.startPoint = CGPointZero;
    [self.layer insertSublayer:gradient atIndex:0];

但它没有做我想要的,我不知道如何让它做我想要的.

目前的结果:

期望的结果是:

Answer 1

这应该做的伎俩:

CAGradientLayer *gradient = [CAGradientLayer layer];
[gradient setFrame:[self bounds]];

//Pink color to set with your needs
UIColor *pinkColor = [UIColor colorWithRed:1 green:105/255.0 blue:180/255.0 alpha:1];
gradient.colors = @[(id)[pinkColor CGColor],
                    (id)[[UIColor whiteColor] CGColor],
                    (id)[[UIColor whiteColor] CGColor],
                    (id)[pinkColor CGColor]];

//You may have to change these values to your needs.
[gradient setLocations:@[@(0.0), @(0.2), @(0.8), @(1.0)]];

//From Upper Right to Bottom Left
[gradient setStartPoint:CGPointMake(1, 0)];
[gradient setEndPoint:CGPointMake(0, 1)];

//Apply
[[self layer] insertSublayer:gradient atIndex:0];

你必须阅读有关的文档CAGradientLayer.