背景色随轮播图变化
#import "ViewController.h"
#import "CDRadianLayerView.h"
#import "DCMacro.h"
@interface ViewController ()<UIScrollViewDelegate>
@property (nonatomic, strong) UIView *bgView;
@property (nonatomic, strong) NSMutableArray *colorArray;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"white%@白色",[self isWhiteColor:[UIColor whiteColor]]?@"是":@"不是");
NSLog(@"grayColor%@白色",[self isWhiteColor:[UIColor grayColor]]?@"是":@"不是");
NSLog(@"darkGrayColor%@白色",[self isWhiteColor:[UIColor darkGrayColor]]?@"是":@"不是");
NSLog(@"lightGrayColor%@白色",[self isWhiteColor:[UIColor lightGrayColor]]?@"是":@"不是");
self.colorArray = [NSMutableArray array];
CDRadianLayerView *view = [[CDRadianLayerView alloc] initWithFrame:CGRectMake(0, 0, SCREENWIDTH, SCREENWIDTH*2/5+StatusBarHeight+400)];
view.backgroundColor = [self stringTOColor:@"#FFFFFF"];
view.radian = 25;
[self.view addSubview:view];
self.bgView = view;
self.bgView.backgroundColor = [self mostColor:[UIImage imageNamed:@"file1.JPG"]];
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, SafeTopHeight, SCREENWIDTH, 400)];
scrollView.bounces = NO;
scrollView.delegate = self;
scrollView.backgroundColor = [UIColor clearColor];
CGFloat left = 0;
for (int i = 0; i<9; i++) {
UIImageView *imgv = [[UIImageView alloc] initWithFrame:CGRectMake(left+15, 0, SCREENWIDTH-15*2, 400)];
imgv.image = [UIImage imageNamed:[NSString stringWithFormat:@"file%d.JPG",i+1]];
[scrollView addSubview:imgv];
left += SCREENWIDTH;
[self.colorArray addObject:[self mostColor:imgv.image]];
}
[self.colorArray addObject:[UIColor whiteColor]];
scrollView.contentSize = CGSizeMake(left, 0);
[self.view addSubview:scrollView];
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSInteger page = scrollView.contentOffset.x/SCREENWIDTH;
CGFloat value = ((int)scrollView.contentOffset.x%(int)SCREENWIDTH)/SCREENWIDTH;
self.bgView.backgroundColor = [self colorGradient:value startColor:self.colorArray[page] endColor:self.colorArray[page+1]];
}
-(UIColor *)mostColor:(UIImage*)image{
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1
int bitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedLast;
#else
int bitmapInfo = kCGImageAlphaPremultipliedLast;
#endif
//第一步 先把图片缩小 加快计算速度. 但越小结果误差可能越大
CGSize thumbSize=CGSizeMake(50, 50);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL,
thumbSize.width,
thumbSize.height,
8,//bits per component
thumbSize.width*4,
colorSpace,
bitmapInfo);
CGRect drawRect = CGRectMake(0, 0, thumbSize.width, thumbSize.height);
CGContextDrawImage(context, drawRect, image.CGImage);
CGColorSpaceRelease(colorSpace);
//第二步 取每个点的像素值
unsigned char* data = CGBitmapContextGetData (context);
if (data == NULL) return nil;
NSCountedSet *cls=[NSCountedSet setWithCapacity:thumbSize.width*thumbSize.height];
for (int x=0; x<thumbSize.width; x++) {
for (int y=0; y<thumbSize.height; y++) {
int offset = 4*(x*y);
int red = data[offset];
int green = data[offset+1];
int blue = data[offset+2];
int alpha = data[offset+3];
NSArray *clr=@[@(red),@(green),@(blue),@(alpha)];
[cls addObject:clr];
}
}
CGContextRelease(context);
//第三步 找到出现次数最多的那个颜色
NSEnumerator *enumerator = [cls objectEnumerator];
NSArray *curColor = nil;
NSArray *MaxColor=nil;
NSUInteger MaxCount=0;
while ( (curColor = [enumerator nextObject]) != nil )
{
NSUInteger tmpCount = [cls countForObject:curColor];
if ( tmpCount < MaxCount ) continue;
MaxCount=tmpCount;
MaxColor=curColor;
}
UIColor *color = [UIColor colorWithRed:([MaxColor[0] intValue]/255.0f) green:([MaxColor[1] intValue]/255.0f) blue:([MaxColor[2] intValue]/255.0f) alpha:([MaxColor[3] intValue]/255.0f)];
return [self isWhiteColor:color]?[self stringTOColor:@"#F5F5F5"]:color;
}
- (UIColor *)stringTOColor:(NSString *)str{
if (!str || [str isEqualToString:@""]) {
return nil;
}
unsigned red,green,blue;
NSRange range;
range.length = 2;
range.location = 1;
[[NSScanner scannerWithString:[str substringWithRange:range]] scanHexInt:&red];
range.location = 3;
[[NSScanner scannerWithString:[str substringWithRange:range]] scanHexInt:&green];
range.location = 5;
[[NSScanner scannerWithString:[str substringWithRange:range]] scanHexInt:&blue];
UIColor *color= [UIColor colorWithRed:red/255.0f green:green/255.0f blue:blue/255.0f alpha:1];
return color;
}
- (BOOL)isWhiteColor:(UIColor *)color
{
CGFloat red = 0.0;
CGFloat green = 0.0;
CGFloat blue = 0.0;
CGFloat alpha = 0.0;
[color getRed:&red green:&green blue:&blue alpha:&alpha];
return (red>0.941&&green>0.941&&blue>0.941);
}
-(UIColor *)colorGradient:(CGFloat)value startColor:(UIColor *)startColor endColor:(UIColor *)endColor
{
if (value < 0) value = 0;
if (value > 1) value = 1;
CGFloat sred = 0.0;
CGFloat sgreen = 0.0;
CGFloat sblue = 0.0;
CGFloat salpha = 0.0;
[startColor getRed:&sred green:&sgreen blue:&sblue alpha:&salpha];
CGFloat ered = 0.0;
CGFloat egreen = 0.0;
CGFloat eblue = 0.0;
CGFloat ealpha = 0.0;
[endColor getRed:&ered green:&egreen blue:&eblue alpha:&ealpha];
CGFloat cursorred = sred + (ered-sred)*value;
CGFloat cursorgreen = sgreen + (egreen-sgreen)*value;
CGFloat cursorblue = sblue + (eblue-sblue)*value;
UIColor *color = [UIColor colorWithRed:cursorred green:cursorgreen blue:cursorblue alpha:1];
return color;
}
@end
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
typedef NS_ENUM(NSInteger, CDRadianDirection) {
CDRadianDirectionBottom = 0,
CDRadianDirectionTop = 1,
CDRadianDirectionLeft = 2,
CDRadianDirectionRight = 3,
};
@interface CDRadianLayerView : UIView
// 圆弧方向, 默认在下方
@property (nonatomic) CDRadianDirection direction;
// 圆弧高/宽, 可为负值。 正值凸, 负值凹
@property (nonatomic) CGFloat radian;
@end
#import "CDRadianLayerView.h"
@implementation CDRadianLayerView
- (void)setRadian:(CGFloat) radian
{
if(radian == 0) return;
CGFloat t_width = CGRectGetWidth(self.frame); // 宽
CGFloat t_height = CGRectGetHeight(self.frame); // 高
CGFloat height = fabs(radian); // 圆弧高度
CGFloat x = 0;
CGFloat y = 0;
// 计算圆弧的最大高度
CGFloat _maxRadian = 0;
switch (self.direction) {
case CDRadianDirectionBottom:
case CDRadianDirectionTop:
_maxRadian = MIN(t_height, t_width / 2);
break;
case CDRadianDirectionLeft:
case CDRadianDirectionRight:
_maxRadian = MIN(t_height / 2, t_width);
break;
default:
break;
}
if(height > _maxRadian){
NSLog(@"圆弧半径过大, 跳过设置。");
return;
}
// 计算半径
CGFloat radius = 0;
switch (self.direction) {
case CDRadianDirectionBottom:
case CDRadianDirectionTop:
{
CGFloat c = sqrt(pow(t_width / 2, 2) + pow(height, 2));
CGFloat sin_bc = height / c;
radius = c / ( sin_bc * 2);
}
break;
case CDRadianDirectionLeft:
case CDRadianDirectionRight:
{
CGFloat c = sqrt(pow(t_height / 2, 2) + pow(height, 2));
CGFloat sin_bc = height / c;
radius = c / ( sin_bc * 2);
}
break;
default:
break;
}
// 画圆
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
[shapeLayer setFillColor:[[UIColor whiteColor] CGColor]];
CGMutablePathRef path = CGPathCreateMutable();
switch (self.direction) {
case CDRadianDirectionBottom:
{
if(radian > 0){
CGPathMoveToPoint(path,NULL, t_width,t_height - height);
CGPathAddArc(path,NULL, t_width / 2, t_height - radius, radius, asin((radius - height ) / radius), M_PI - asin((radius - height ) / radius), NO);
}else{
CGPathMoveToPoint(path,NULL, t_width,t_height);
CGPathAddArc(path,NULL, t_width / 2, t_height + radius - height, radius, 2 * M_PI - asin((radius - height ) / radius), M_PI + asin((radius - height ) / radius), YES);
}
CGPathAddLineToPoint(path,NULL, x, y);
CGPathAddLineToPoint(path,NULL, t_width, y);
}
break;
case CDRadianDirectionTop:
{
if(radian > 0){
CGPathMoveToPoint(path,NULL, t_width, height);
CGPathAddArc(path,NULL, t_width / 2, radius, radius, 2 * M_PI - asin((radius - height ) / radius), M_PI + asin((radius - height ) / radius), YES);
}else{
CGPathMoveToPoint(path,NULL, t_width, y);
CGPathAddArc(path,NULL, t_width / 2, height - radius, radius, asin((radius - height ) / radius), M_PI - asin((radius - height ) / radius), NO);
}
CGPathAddLineToPoint(path,NULL, x, t_height);
CGPathAddLineToPoint(path,NULL, t_width, t_height);
}
break;
case CDRadianDirectionLeft:
{
if(radian > 0){
CGPathMoveToPoint(path,NULL, height, y);
CGPathAddArc(path,NULL, radius, t_height / 2, radius, M_PI + asin((radius - height ) / radius), M_PI - asin((radius - height ) / radius), YES);
}else{
CGPathMoveToPoint(path,NULL, x, y);
CGPathAddArc(path,NULL, height - radius, t_height / 2, radius, 2 * M_PI - asin((radius - height ) / radius), asin((radius - height ) / radius), NO);
}
CGPathAddLineToPoint(path,NULL, t_width, t_height);
CGPathAddLineToPoint(path,NULL, t_width, y);
}
break;
case CDRadianDirectionRight:
{
if(radian > 0){
CGPathMoveToPoint(path,NULL, t_width - height, y);
CGPathAddArc(path,NULL, t_width - radius, t_height / 2, radius, 1.5 * M_PI + asin((radius - height ) / radius), M_PI / 2 + asin((radius - height ) / radius), NO);
}else{
CGPathMoveToPoint(path,NULL, t_width, y);
CGPathAddArc(path,NULL, t_width + radius - height, t_height / 2, radius, M_PI + asin((radius - height ) / radius), M_PI - asin((radius - height ) / radius), YES);
}
CGPathAddLineToPoint(path,NULL, x, t_height);
CGPathAddLineToPoint(path,NULL, x, y);
}
break;
default:
break;
}
CGPathCloseSubpath(path);
[shapeLayer setPath:path];
CFRelease(path);
self.layer.mask = shapeLayer;
}
@end
