渐变色以及隐藏输入框光标

CAGradientLayer *layer = [CAGradientLayer layer];

layer.startPoint = (CGPoint){0.0f, 0.0f};

layer.endPoint = (CGPoint){0.0f, 1.0f};

layer.colors = [NSArray arrayWithObjects:(id)[UIColor cyanColor].CGColor, (id)[UIColor redColor].CGColor, (id)[UIColor greenColor].CGColor, nil];

layer.locations = @[@0.0f, @0.4f, @1.0f];

layer.frame = self.view.layer.bounds;

[self.view.layer insertSublayer:layer atIndex:0];

//textFiled.tintColor = [UIColor clearColor];