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iOS: implements locations in gradient color

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王劲鹏 2020-05-09 19:39:17 +08:00 committed by osborn
parent 506f89930e
commit 9759eac38b
1 changed files with 29 additions and 7 deletions
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36
doric-iOS/Pod/Classes/Shader/DoricViewNode.m
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@ -317,6 +317,7 @@ + (__kindof DoricViewNode *)create:(DoricContext *)context withType:(NSString *)
} }
- (UIImage *)gradientImageFromColors:(NSArray *)colors - (UIImage *)gradientImageFromColors:(NSArray *)colors
locations:(CGFloat *)locations
startPoint:(CGPoint)startPoint startPoint:(CGPoint)startPoint
endPoint:(CGPoint)endPoint endPoint:(CGPoint)endPoint
imgSize:(CGSize)imgSize { imgSize:(CGSize)imgSize {
@ -324,7 +325,7 @@ - (UIImage *)gradientImageFromColors:(NSArray *)colors
CGContextRef context = UIGraphicsGetCurrentContext(); CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context); CGContextSaveGState(context);
CGColorSpaceRef colorSpace = CGColorGetColorSpace((__bridge CGColorRef) colors.lastObject); CGColorSpaceRef colorSpace = CGColorGetColorSpace((__bridge CGColorRef) colors.lastObject);
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colors, NULL); CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colors, locations);
CGPoint start = (CGPoint) {startPoint.x * imgSize.width, startPoint.y * imgSize.height}; CGPoint start = (CGPoint) {startPoint.x * imgSize.width, startPoint.y * imgSize.height};
CGPoint end = (CGPoint) {endPoint.x * imgSize.width, endPoint.y * imgSize.height}; CGPoint end = (CGPoint) {endPoint.x * imgSize.width, endPoint.y * imgSize.height};
CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation); CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
@ -341,12 +342,18 @@ - (void)requestLayout {
return; return;
} }
self.gradientSize = self.view.frame.size; self.gradientSize = self.view.frame.size;
NSMutableArray *colors = [[NSMutableArray alloc] init]; NSMutableArray *colors = [[NSMutableArray alloc] init];
NSMutableArray *arrayLocations = nil;
if ([dict objectForKey:@"colors"] != nil) { if ([dict objectForKey:@"colors"] != nil) {
NSMutableArray *array = [dict mutableArrayValueForKey:@"colors"]; NSMutableArray *arrayColors = [dict mutableArrayValueForKey:@"colors"];
[array forEach:^(id obj) { [arrayColors forEach:^(id obj) {
[colors addObject:(__bridge id) DoricColor(obj).CGColor]; [colors addObject:(__bridge id) DoricColor(obj).CGColor];
}]; }];
if ([dict objectForKey:@"locations"] != nil) {
arrayLocations = [dict mutableArrayValueForKey:@"locations"];
}
} else { } else {
if ([dict objectForKey:@"start"] != nil && [dict objectForKey:@"end"] != nil) { if ([dict objectForKey:@"start"] != nil && [dict objectForKey:@"end"] != nil) {
UIColor *start = DoricColor(dict[@"start"]); UIColor *start = DoricColor(dict[@"start"]);
@ -385,10 +392,25 @@ - (void)requestLayout {
startPoint = CGPointMake(0, 0); startPoint = CGPointMake(0, 0);
endPoint = CGPointMake(0, 1); endPoint = CGPointMake(0, 1);
} }
UIImage *gradientImage = [self gradientImageFromColors:colors
startPoint:startPoint UIImage *gradientImage;
endPoint:endPoint if (arrayLocations != nil) {
imgSize:self.gradientSize]; CGFloat locations[arrayLocations.count];
for (int i = 0; i != arrayLocations.count; i++) {
locations[i] = [arrayLocations[i] floatValue];
}
gradientImage = [self gradientImageFromColors:colors
locations:locations
startPoint:startPoint
endPoint:endPoint
imgSize:self.gradientSize];
} else {
gradientImage = [self gradientImageFromColors:colors
locations:NULL
startPoint:startPoint
endPoint:endPoint
imgSize:self.gradientSize];
}
self.view.backgroundColor = [UIColor colorWithPatternImage:gradientImage]; self.view.backgroundColor = [UIColor colorWithPatternImage:gradientImage];
}]; }];
} }