ios - UITextview底部的渐变层

Question

如何在 iOS UITextView 中实现与下图相同的效果。 UITextView

底部的模糊效果

提前致谢:)

Answer 1

尝试以下操作:我尝试使用图像但不是 UITextView

UIView *vwTest = [[UIView alloc] initWithFrame:_textView.frame];
[vwTest setBackgroundColor:[UIColor whiteColor]];
[vwTest setUserInteractionEnabled:NO];
[self.view addSubview:vwTest];

NSArray *colors = [NSArray arrayWithObjects:
                   (id)[[UIColor colorWithWhite:0 alpha:1] CGColor],
                   (id)[[UIColor colorWithWhite:0 alpha:0] CGColor],
                   nil];

CAGradientLayer *layer = [CAGradientLayer layer];
[layer setFrame:vwTest.bounds];
[layer setColors:colors];
[layer setStartPoint:CGPointMake(0.0f, 1.0f)];
[layer setEndPoint:CGPointMake(0.0f, 0.6f)];
[vwTest.layer setMask:layer];