HTVGradientLayer.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN
//渐变蒙层
@interface HTVGradientLayer : UIView

@end

NS_ASSUME_NONNULL_END

HTVGradientLayer.m

#import "HTVGradientLayer.h"

@interface HTVGradientLayer ()

@property (nonatomic, strong) CAGradientLayer *gradientLayer;

@end

@implementation HTVGradientLayer

- (instancetype)init
{
    
    self = [super init];
    if (self) {
        
        [self initLayerMask];
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame
{
    
    self = [super initWithFrame:frame];
    
    if (self) {
        [self initLayerMask];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    
    self = [super initWithCoder:aDecoder];
    if (self) {
        
        [self initLayerMask];
    }
    return self;
}

- (void)initLayerMask
{
    
    self.layer.mask = self.gradientLayer;
}

- (CAGradientLayer *)gradientLayer
{
    
    if (_gradientLayer == nil) {
        _gradientLayer = [[CAGradientLayer alloc] init];
        _gradientLayer.colors = @[(__bridge id)[[UIColor blackColor] colorWithAlphaComponent:0.2].CGColor,(__bridge id)[UIColor blackColor].CGColor];
        _gradientLayer.locations = @[@0.0, @0.2,@1.0];
    }
    return _gradientLayer;
}


- (void)layoutSublayersOfLayer:(CALayer *)layer
{
    
    [super layoutSublayersOfLayer:layer];
    
    _gradientLayer.frame = self.bounds;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    [CATransaction begin];
    [CATransaction setDisableActions:YES];
    self.gradientLayer.frame = self.bounds;
    [CATransaction commit];
}

@end