[iOS]UIView+AZGradient

在项目中看见一个比较好的扩展, 用来处理UIView的渐变色问题.
搜索了一下应该是这个大佬写的https://www.jianshu.com/p/e7c9e94e165b
这里也用demo验证一下备份收藏
资源下载,会Copy的同学就不用下载了,不能免积分这只是自己用来下载的.

@implementation InfoViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [_view1 az_setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor blueColor]] locations:nil startPoint:CGPointMake(0, 0) endPoint:CGPointMake(0, 1)];
    
    [_view2 az_setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor blueColor]] locations:nil startPoint:CGPointMake(0, 0) endPoint:CGPointMake(1, 1)];

    [_view3 az_setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor orangeColor],[UIColor blackColor],[UIColor blueColor]] locations:@[[NSNumber numberWithFloat:0] ,[NSNumber numberWithFloat:0.4] ,[NSNumber numberWithFloat:0.8] ,[NSNumber numberWithFloat:1]] startPoint:CGPointMake(0, 0) endPoint:CGPointMake(1, 0)];

    UIView *newView = [UIView az_gradientViewWithColors:@[[UIColor redColor],[UIColor blueColor]] locations:nil startPoint:CGPointMake(1, 0) endPoint:CGPointMake(0, 1)];
    newView.frame = _view4.bounds;
    [_view4 addSubview:newView];
}

@end

示意图:

UIView+AZGradient

//
//  UIView+AZGradient.h
//  AZCategory
//
//  Created by Alfred Zhang on 2017/6/29.
//  Copyright © 2017年 Alfred Zhang. All rights reserved.
//

#import 

@interface UIView (AZGradient)

/* The array of CGColorRef objects defining the color of each gradient
 * stop. Defaults to nil. Animatable. */

@property(nullable, copy) NSArray *az_colors;

/* An optional array of NSNumber objects defining the location of each
 * gradient stop as a value in the range [0,1]. The values must be
 * monotonically increasing. If a nil array is given, the stops are
 * assumed to spread uniformly across the [0,1] range. When rendered,
 * the colors are mapped to the output colorspace before being
 * interpolated. Defaults to nil. Animatable. */

@property(nullable, copy) NSArray *az_locations;

/* The start and end points of the gradient when drawn into the layer's
 * coordinate space. The start point corresponds to the first gradient
 * stop, the end point to the last gradient stop. Both points are
 * defined in a unit coordinate space that is then mapped to the
 * layer's bounds rectangle when drawn. (I.e. [0,0] is the bottom-left
 * corner of the layer, [1,1] is the top-right corner.) The default values
 * are [.5,0] and [.5,1] respectively. Both are animatable. */

@property CGPoint az_startPoint;
@property CGPoint az_endPoint;

+ (UIView *_Nullable)az_gradientViewWithColors:(NSArray *_Nullable)colors locations:(NSArray *_Nullable)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint;

- (void)az_setGradientBackgroundWithColors:(NSArray *_Nullable)colors locations:(NSArray *_Nullable)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint;

@end

//
//  UIView+AZGradient.m
//  AZCategory
//
//  Created by Alfred Zhang on 2017/6/29.
//  Copyright © 2017年 Alfred Zhang. All rights reserved.
//

#import "UIView+AZGradient.h"
#import 

@implementation UIView (AZGradient)

+ (Class)layerClass {
    return [CAGradientLayer class];
}

+ (UIView *)az_gradientViewWithColors:(NSArray *)colors locations:(NSArray *)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint {
    UIView *view = [[self alloc] init];
    [view az_setGradientBackgroundWithColors:colors locations:locations startPoint:startPoint endPoint:endPoint];
    return view;
}

- (void)az_setGradientBackgroundWithColors:(NSArray *)colors locations:(NSArray *)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint {
    NSMutableArray *colorsM = [NSMutableArray array];
    for (UIColor *color in colors) {
        [colorsM addObject:(__bridge id)color.CGColor];
    }
    self.az_colors = [colorsM copy];
    self.az_locations = locations;
    self.az_startPoint = startPoint;
    self.az_endPoint = endPoint;
}

#pragma mark- Getter&Setter

- (NSArray *)az_colors {
    return objc_getAssociatedObject(self, _cmd);
}

- (void)setAz_colors:(NSArray *)colors {
    objc_setAssociatedObject(self, @selector(az_colors), colors, OBJC_ASSOCIATION_COPY_NONATOMIC);
    if ([self.layer isKindOfClass:[CAGradientLayer class]]) {
        [((CAGradientLayer *)self.layer) setColors:self.az_colors];
    }
}

- (NSArray *)az_locations {
    return objc_getAssociatedObject(self, _cmd);
}

- (void)setAz_locations:(NSArray *)locations {
    objc_setAssociatedObject(self, @selector(az_locations), locations, OBJC_ASSOCIATION_COPY_NONATOMIC);
    if ([self.layer isKindOfClass:[CAGradientLayer class]]) {
        [((CAGradientLayer *)self.layer) setLocations:self.az_locations];
    }
}

- (CGPoint)az_startPoint {
    return [objc_getAssociatedObject(self, _cmd) CGPointValue];
}

- (void)setAz_startPoint:(CGPoint)startPoint {
    objc_setAssociatedObject(self, @selector(az_startPoint), [NSValue valueWithCGPoint:startPoint], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if ([self.layer isKindOfClass:[CAGradientLayer class]]) {
        [((CAGradientLayer *)self.layer) setStartPoint:self.az_startPoint];
    }
}

- (CGPoint)az_endPoint {
    return [objc_getAssociatedObject(self, _cmd) CGPointValue];
}

- (void)setAz_endPoint:(CGPoint)endPoint {
    objc_setAssociatedObject(self, @selector(az_endPoint), [NSValue valueWithCGPoint:endPoint], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    if ([self.layer isKindOfClass:[CAGradientLayer class]]) {
        [((CAGradientLayer *)self.layer) setEndPoint:self.az_endPoint];
    }
}

@end

@implementation UILabel (AZGradient)

+ (Class)layerClass {
    return [CAGradientLayer class];
}

@end