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
