121 lines
3.8 KiB
Plaintext
121 lines
3.8 KiB
Plaintext
//
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// UIView+GradientLayer.m
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// YuMi
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//
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// Created by P on 2024/11/18.
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//
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#import "UIView+GradientLayer.h"
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#import <QuartzCore/QuartzCore.h>
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@implementation UIView (GradientLayer)
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static NSString * const kGradientLayerName = @"GradientLayer";
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static void *kGradientObserverKey = &kGradientObserverKey;
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// 添加渐变背景
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- (void)addGradientBackgroundWithColors:(NSArray<UIColor *> *)colors
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startPoint:(CGPoint)startPoint
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endPoint:(CGPoint)endPoint
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cornerRadius:(CGFloat)cornerRadius {
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// 确保移除已有的渐变背景和 KVO 监听
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[self removeGradientBackground];
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// 创建渐变图层
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CAGradientLayer *gradientLayer = [CAGradientLayer layer];
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gradientLayer.name = kGradientLayerName;
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gradientLayer.colors = [self cgColorsFromUIColors:colors];
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gradientLayer.startPoint = startPoint;
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gradientLayer.endPoint = endPoint;
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gradientLayer.cornerRadius = cornerRadius;
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// 初次设置 frame
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gradientLayer.frame = self.bounds;
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[self.layer insertSublayer:gradientLayer atIndex:0];
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// 添加 KVO 监听
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[self setupLayoutObserverForGradientLayer:gradientLayer];
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}
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// 动态更新渐变背景
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- (void)updateGradientBackgroundWithColors:(NSArray<UIColor *> *)colors
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startPoint:(CGPoint)startPoint
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endPoint:(CGPoint)endPoint {
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CAGradientLayer *gradientLayer = [self gradientLayer];
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if (gradientLayer) {
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gradientLayer.colors = [self cgColorsFromUIColors:colors];
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gradientLayer.startPoint = startPoint;
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gradientLayer.endPoint = endPoint;
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}
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}
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// 移除渐变背景和监听
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- (void)removeGradientBackground {
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// 移除渐变图层
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CAGradientLayer *gradientLayer = [self gradientLayer];
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if (gradientLayer) {
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[gradientLayer removeFromSuperlayer];
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}
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// 移除 KVO 监听
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if ([self hasAddedObserver]) {
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[self removeObserver:self forKeyPath:@"bounds"];
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[self setHasAddedObserver:NO];
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}
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}
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// 获取渐变图层
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- (CAGradientLayer *)gradientLayer {
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for (CALayer *layer in self.layer.sublayers) {
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if ([layer.name isEqualToString:kGradientLayerName] &&
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[layer isKindOfClass:[CAGradientLayer class]]) {
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return (CAGradientLayer *)layer;
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}
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}
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return nil;
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}
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// 添加 KVO 监听
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- (void)setupLayoutObserverForGradientLayer:(CAGradientLayer *)gradientLayer {
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if (![self hasAddedObserver]) {
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[self addObserver:self forKeyPath:@"bounds" options:NSKeyValueObservingOptionNew context:(__bridge void *)gradientLayer];
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[self setHasAddedObserver:YES];
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}
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}
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// KVO 监听回调
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- (void)observeValueForKeyPath:(NSString *)keyPath
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ofObject:(id)object
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change:(NSDictionary<NSKeyValueChangeKey,id> *)change
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context:(void *)context {
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if ([keyPath isEqualToString:@"bounds"]) {
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CAGradientLayer *gradientLayer = (__bridge CAGradientLayer *)context;
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gradientLayer.frame = self.bounds; // 更新渐变图层的 frame
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} else {
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[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
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}
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}
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// 工具方法：转换颜色数组
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- (NSArray *)cgColorsFromUIColors:(NSArray<UIColor *> *)colors {
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NSMutableArray *cgColors = [NSMutableArray array];
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for (UIColor *color in colors) {
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[cgColors addObject:(id)color.CGColor];
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}
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return [cgColors copy];
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}
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// 工具方法：判断是否已注册 KVO
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- (BOOL)hasAddedObserver {
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return [objc_getAssociatedObject(self, kGradientObserverKey) boolValue];
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}
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// 工具方法：设置是否已注册 KVO
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- (void)setHasAddedObserver:(BOOL)added {
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objc_setAssociatedObject(self, kGradientObserverKey, @(added), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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@end
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