iOS给视图设置渐变颜色

UIView *colorView = [[UIView alloc] init];

 [colorView setFrame:CGRectMake(20, 160, self.view.frame.size.width - 40, self.view.frame.size.height - 320)];

 [self.view addSubview:colorView];

//设置渐变色

 CAGradientLayer *gradient = [CAGradientLayer layer];

 gradient.frame = colorView.bounds;

 gradient.colors = [NSArray arrayWithObjects: (id)[UIColor colorWithRed:0 green:143/255.0 blue:234/255.0 alpha:1.0].CGColor, (id)[UIColor colorWithRed:0 green:173/255.0 blue:234/255.0 alpha:1.0].CGColor, (id)[UIColor whiteColor].CGColor, nil];

 [colorView.layer addSublayer:gradient];