keep edit

YuMi/CustomUI/UIViewGradientLayer/UIView+GradientLayer.m.backup

@@ -0,0 +1,120 @@
+//
+//  UIView+GradientLayer.m
+//  YuMi
+//
+//  Created by P on 2024/11/18.
+//
+
+#import "UIView+GradientLayer.h"
+#import <QuartzCore/QuartzCore.h>
+
+@implementation UIView (GradientLayer)
+
+static NSString * const kGradientLayerName = @"GradientLayer";
+static void *kGradientObserverKey = &kGradientObserverKey;
+
+// 添加渐变背景
+- (void)addGradientBackgroundWithColors:(NSArray<UIColor *> *)colors
+                              startPoint:(CGPoint)startPoint
+                                endPoint:(CGPoint)endPoint
+                             cornerRadius:(CGFloat)cornerRadius {
+    // 确保移除已有的渐变背景和 KVO 监听
+    [self removeGradientBackground];
+
+    // 创建渐变图层
+    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
+    gradientLayer.name = kGradientLayerName;
+    gradientLayer.colors = [self cgColorsFromUIColors:colors];
+    gradientLayer.startPoint = startPoint;
+    gradientLayer.endPoint = endPoint;
+    gradientLayer.cornerRadius = cornerRadius;
+
+    // 初次设置 frame
+    gradientLayer.frame = self.bounds;
+
+    [self.layer insertSublayer:gradientLayer atIndex:0];
+
+    // 添加 KVO 监听
+    [self setupLayoutObserverForGradientLayer:gradientLayer];
+}
+
+// 动态更新渐变背景
+- (void)updateGradientBackgroundWithColors:(NSArray<UIColor *> *)colors
+                                 startPoint:(CGPoint)startPoint
+                                   endPoint:(CGPoint)endPoint {
+    CAGradientLayer *gradientLayer = [self gradientLayer];
+    if (gradientLayer) {
+        gradientLayer.colors = [self cgColorsFromUIColors:colors];
+        gradientLayer.startPoint = startPoint;
+        gradientLayer.endPoint = endPoint;
+    }
+}
+
+// 移除渐变背景和监听
+- (void)removeGradientBackground {
+    // 移除渐变图层
+    CAGradientLayer *gradientLayer = [self gradientLayer];
+    if (gradientLayer) {
+        [gradientLayer removeFromSuperlayer];
+    }
+
+    // 移除 KVO 监听
+    if ([self hasAddedObserver]) {
+        [self removeObserver:self forKeyPath:@"bounds"];
+        [self setHasAddedObserver:NO];
+    }
+}
+
+// 获取渐变图层
+- (CAGradientLayer *)gradientLayer {
+    for (CALayer *layer in self.layer.sublayers) {
+        if ([layer.name isEqualToString:kGradientLayerName] &&
+            [layer isKindOfClass:[CAGradientLayer class]]) {
+            return (CAGradientLayer *)layer;
+        }
+    }
+    return nil;
+}
+
+// 添加 KVO 监听
+- (void)setupLayoutObserverForGradientLayer:(CAGradientLayer *)gradientLayer {
+    if (![self hasAddedObserver]) {
+        [self addObserver:self forKeyPath:@"bounds" options:NSKeyValueObservingOptionNew context:(__bridge void *)gradientLayer];
+        [self setHasAddedObserver:YES];
+    }
+}
+
+// KVO 监听回调
+- (void)observeValueForKeyPath:(NSString *)keyPath
+                      ofObject:(id)object
+                        change:(NSDictionary<NSKeyValueChangeKey,id> *)change
+                       context:(void *)context {
+    if ([keyPath isEqualToString:@"bounds"]) {
+        CAGradientLayer *gradientLayer = (__bridge CAGradientLayer *)context;
+        gradientLayer.frame = self.bounds; // 更新渐变图层的 frame
+    } else {
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
+    }
+}
+
+// 工具方法：转换颜色数组
+- (NSArray *)cgColorsFromUIColors:(NSArray<UIColor *> *)colors {
+    NSMutableArray *cgColors = [NSMutableArray array];
+    for (UIColor *color in colors) {
+        [cgColors addObject:(id)color.CGColor];
+    }
+    return [cgColors copy];
+}
+
+// 工具方法：判断是否已注册 KVO
+- (BOOL)hasAddedObserver {
+    return [objc_getAssociatedObject(self, kGradientObserverKey) boolValue];
+}
+
+// 工具方法：设置是否已注册 KVO
+- (void)setHasAddedObserver:(BOOL)added {
+    objc_setAssociatedObject(self, kGradientObserverKey, @(added), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+
+
+@end