渐变UI

1.h

#import <UIKit/UIKit.h>

@interface UIView (Gradient)

/* The array of CGColorRef objects defining the color of each gradient

* stop. Defaults to nil. Animatable. */

@property(nullable, copy) NSArray *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<NSNumber *> *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 startPoint;

@property CGPoint endPoint;

+ (UIView *_Nullable)gradientViewWithColors:(NSArray<UIColor *> *_Nullable)colors locations:(NSArray<NSNumber *> *_Nullable)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint;

- (void)setGradientBackgroundWithColors:(NSArray<UIColor *> *_Nullable)colors locations:(NSArray<NSNumber *> *_Nullable)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint;

@end

2.m

#import "UIView+Gradient.h"

#import <objc/runtime.h>

@implementation UIView (Gradient)

+ (Class)layerClass {

return [CAGradientLayer class];

}

+ (UIView *)gradientViewWithColors:(NSArray<UIColor *> *)colors locations:(NSArray<NSNumber *> *)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint {

UIView *view = [[self alloc] init];

[view setGradientBackgroundWithColors:colors locations:locations startPoint:startPoint endPoint:endPoint];

return view;

}

- (void)setGradientBackgroundWithColors:(NSArray<UIColor *> *)colors locations:(NSArray<NSNumber *> *)locations startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint {

NSMutableArray *colorsM = [NSMutableArray array];

for (UIColor *color in colors) {

[colorsM addObject:(__bridge id)color.CGColor];

}

self.colors = [colorsM copy];

self.locations = locations;

self.startPoint = startPoint;

self.endPoint = endPoint;

}

#pragma mark- Getter&Setter

- (NSArray *)colors {

return objc_getAssociatedObject(self, _cmd);

}

- (void)setColors:(NSArray *)colors {

objc_setAssociatedObject(self, @selector(colors), colors, OBJC_ASSOCIATION_COPY_NONATOMIC);

if ([self.layer isKindOfClass:[CAGradientLayer class]]) {

[((CAGradientLayer *)self.layer) setColors:self.colors];

}

}

- (NSArray<NSNumber *> *)locations {

return objc_getAssociatedObject(self, _cmd);

}

- (void)setLocations:(NSArray<NSNumber *> *)locations {

objc_setAssociatedObject(self, @selector(locations), locations, OBJC_ASSOCIATION_COPY_NONATOMIC);

if ([self.layer isKindOfClass:[CAGradientLayer class]]) {

[((CAGradientLayer *)self.layer) setLocations:self.locations];

}

}

- (CGPoint)startPoint {

return [objc_getAssociatedObject(self, _cmd) CGPointValue];

}

- (void)setStartPoint:(CGPoint)startPoint {

objc_setAssociatedObject(self, @selector(startPoint), [NSValue valueWithCGPoint:startPoint], OBJC_ASSOCIATION_RETAIN_NONATOMIC);

if ([self.layer isKindOfClass:[CAGradientLayer class]]) {

[((CAGradientLayer *)self.layer) setStartPoint:self.startPoint];

}

}

- (CGPoint)endPoint {

return [objc_getAssociatedObject(self, _cmd) CGPointValue];

}

- (void)setEndPoint:(CGPoint)endPoint {

objc_setAssociatedObject(self, @selector(endPoint), [NSValue valueWithCGPoint:endPoint], OBJC_ASSOCIATION_RETAIN_NONATOMIC);

if ([self.layer isKindOfClass:[CAGradientLayer class]]) {

[((CAGradientLayer *)self.layer) setEndPoint:self.endPoint];

}

}

3.调用

- (void)gradientTest {

self.view.backgroundColor = [UIColor whiteColor];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 80, 200, 30)];

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 120, 200, 30)];

UIView *tempView = [[UIView alloc] initWithFrame:CGRectMake(0, 160, 200, 30)];

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 200, 200, 30)];

[self.view addSubview:label];

[self.view addSubview:btn];

[self.view addSubview:tempView];

[self.view addSubview:imageView];

label.backgroundColor = [UIColor clearColor];

btn.backgroundColor = [UIColor blueColor];

tempView.backgroundColor = [UIColor blueColor];

imageView.backgroundColor = [UIColor blueColor];

[label setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor orangeColor]] locations:nil startPoint:CGPointMake(0, 0) endPoint:CGPointMake(1, 0)];

[btn setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor orangeColor]] locations:nil startPoint:CGPointMake(0, 0) endPoint:CGPointMake(1, 0)];

[tempView setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor orangeColor]] locations:nil startPoint:CGPointMake(0, 0) endPoint:CGPointMake(1, 0)];

[imageView setGradientBackgroundWithColors:@[[UIColor redColor],[UIColor orangeColor]] locations:nil startPoint:CGPointMake(0, 0) endPoint:CGPointMake(1, 0)];

label.text = @"Text";

label.textAlignment = NSTextAlignmentCenter;

[btn setTitle:@"Button" forState:UIControlStateNormal];

}

@end

@implementation UILabel (Gradient)

+ (Class)layerClass {

return [CAGradientLayer class];

}

@end

原链接为:https://www.jianshu.com/p/e7c9e94e165b

在网上找的代码,如有侵权,请联系本人,谢谢