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iOS: impl text color with gradient

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王劲鹏 2021-07-19 19:49:31 +08:00 committed by osborn
parent c877a72c80
commit cd9f08fa97
1 changed files with 111 additions and 1 deletions
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110
doric-iOS/Pod/Classes/Shader/DoricTextNode.m
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@ -44,6 +44,8 @@ @interface DoricTextNode ()
@property(nonatomic, strong) NSMutableParagraphStyle *paragraphStyle;
@property(nonatomic, copy) NSNumber *underline;
@property(nonatomic, copy) NSNumber *strikethrough;
@property(nonatomic, strong) NSDictionary *textGradientProps;
@property(nonatomic, assign) CGSize textGradientSize;
@end
@implementation DoricTextNode
@ -67,7 +69,14 @@ - (void)blendView:(UILabel *)view forPropName:(NSString *)name propValue:(id)pro
view.font = [UIFont systemFontOfSize:[(NSNumber *) prop floatValue]];
}
} else if ([name isEqualToString:@"textColor"]) {
if ([prop isKindOfClass:[NSNumber class]]) {
view.textColor = DoricColor(prop);
self.textGradientProps = nil;
self.textGradientSize = CGSizeZero;
} else if ([prop isKindOfClass:[NSDictionary class]]) {
self.textGradientProps = prop;
self.textGradientSize = CGSizeZero;
}
} else if ([name isEqualToString:@"textAlignment"]) {
DoricGravity gravity = (DoricGravity) [(NSNumber *) prop integerValue];
NSTextAlignment alignment = NSTextAlignmentCenter;
@ -188,4 +197,105 @@ - (void)blend:(NSDictionary *)props {
[super blend:props];
self.view.doricLayout.resolved = NO;
}
- (void)requestLayout {
[super requestLayout];
[self.textGradientProps also:^(NSDictionary *dict) {
if (CGSizeEqualToSize(self.textGradientSize, self.view.frame.size)) {
return;
}
self.textGradientSize = self.view.frame.size;
NSMutableArray *colors = [[NSMutableArray alloc] init];
NSMutableArray *arrayLocations = nil;
if (dict[@"colors"] != nil) {
NSMutableArray *arrayColors = [dict mutableArrayValueForKey:@"colors"];
[arrayColors forEach:^(id obj) {
[colors addObject:(__bridge id) DoricColor(obj).CGColor];
}];
if (dict[@"locations"] != nil) {
arrayLocations = [dict mutableArrayValueForKey:@"locations"];
}
} else {
if (dict[@"start"] != nil && dict[@"end"] != nil) {
UIColor *start = DoricColor(dict[@"start"]);
UIColor *end = DoricColor(dict[@"end"]);
[colors addObject:(__bridge id) start.CGColor];
[colors addObject:(__bridge id) end.CGColor];
}
}
int orientation = [dict[@"orientation"] intValue];
CGPoint startPoint;
CGPoint endPoint;
if (orientation == 1) {
startPoint = CGPointMake(1, 0);
endPoint = CGPointMake(0, 1);
} else if (orientation == 2) {
startPoint = CGPointMake(1, 0);
endPoint = CGPointMake(0, 0);
} else if (orientation == 3) {
startPoint = CGPointMake(1, 1);
endPoint = CGPointMake(0, 0);
} else if (orientation == 4) {
startPoint = CGPointMake(0, 1);
endPoint = CGPointMake(0, 0);
} else if (orientation == 5) {
startPoint = CGPointMake(0, 1);
endPoint = CGPointMake(1, 0);
} else if (orientation == 6) {
startPoint = CGPointMake(0, 0);
endPoint = CGPointMake(1, 0);
} else if (orientation == 7) {
startPoint = CGPointMake(0, 0);
endPoint = CGPointMake(1, 1);
} else {
startPoint = CGPointMake(0, 0);
endPoint = CGPointMake(0, 1);
}
UIImage *gradientImage;
if (arrayLocations != nil) {
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.textGradientSize];
} else {
gradientImage = [self gradientImageFromColors:colors
locations:NULL
startPoint:startPoint
endPoint:endPoint
imgSize:self.textGradientSize];
}
self.view.textColor = [UIColor colorWithPatternImage:gradientImage];
}];
}
- (UIImage *)gradientImageFromColors:(NSArray *)colors
locations:(CGFloat *)locations
startPoint:(CGPoint)startPoint
endPoint:(CGPoint)endPoint
imgSize:(CGSize)imgSize {
UIGraphicsBeginImageContextWithOptions(imgSize, NO, [UIScreen mainScreen].scale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGColorSpaceRef colorSpace = CGColorGetColorSpace((__bridge CGColorRef) colors.lastObject);
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colors, locations);
CGPoint start = (CGPoint) {startPoint.x * imgSize.width, startPoint.y * imgSize.height};
CGPoint end = (CGPoint) {endPoint.x * imgSize.width, endPoint.y * imgSize.height};
CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
CGGradientRelease(gradient);
CGContextRestoreGState(context);
UIGraphicsEndImageContext();
return image;
}
@end