iOS之颜色的调用、显示16进制颜色、渐变色
2024-05-15 06:17:13
十六进制颜色
#import <UIKit/UIKit.h>NS_ASSUME_NONNULL_BEGIN@interface UIColor (HexColor)
+ (UIColor *)wh_colorWithHexString:(NSString *)color alpha:(CGFloat)alpha;
@endNS_ASSUME_NONNULL_END#import "UIColor+HexColor.h"@implementation UIColor (HexColor)
+ (UIColor *)wh_colorWithHexString:(NSString *)color alpha:(CGFloat)alpha
{NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];if ([cString length] < 6){return [UIColor clearColor];}if ([cString hasPrefix:@"0X"]){cString = [cString substringFromIndex:2];}if ([cString hasPrefix:@"#"]){cString = [cString substringFromIndex:1];}if ([cString length] != 6){return [UIColor clearColor];}NSRange range;range.location = 0;range.length = 2;//rNSString *rString = [cString substringWithRange:range];//grange.location = 2;NSString *gString = [cString substringWithRange:range];//brange.location = 4;NSString *bString = [cString substringWithRange:range];unsigned int r, g, b;[[NSScanner scannerWithString:rString] scanHexInt:&r];[[NSScanner scannerWithString:gString] scanHexInt:&g];[[NSScanner scannerWithString:bString] scanHexInt:&b];return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
}
@end//显示16进制颜色+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha{//删除字符串中的空格NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];// String should be 6 or 8 charactersif ([cString length] < 6){return [UIColor clearColor];}// strip 0X if it appears//如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾if ([cString hasPrefix:@"0X"]){cString = [cString substringFromIndex:2];}//如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾if ([cString hasPrefix:@"#"]){cString = [cString substringFromIndex:1];}if ([cString length] != 6){return [UIColor clearColor];}// Separate into r, g, b substringsNSRange range;range.location = 0;range.length = 2;//rNSString *rString = [cString substringWithRange:range];//grange.location = 2;NSString *gString = [cString substringWithRange:range];//brange.location = 4;NSString *bString = [cString substringWithRange:range];// Scan valuesunsigned int r, g, b;[[NSScanner scannerWithString:rString] scanHexInt:&r];[[NSScanner scannerWithString:gString] scanHexInt:&g];[[NSScanner scannerWithString:bString] scanHexInt:&b];return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];}//默认alpha值为1+ (UIColor *)colorWithHexString:(NSString *)color{return [self colorWithHexString:color alpha:1.0f];}===============显示渐变色==========
//16进制颜色、rgb颜色、渐变色#import <UIKit/UIKit.h>@interface UIColor (HEX)
+ (UIColor *)colorWithHex:(UInt32)hex;
+ (UIColor *)colorWithHex:(UInt32)hex andAlpha:(CGFloat)alpha;
+ (UIColor *)colorWithHexString:(NSString *)hexString;
- (NSString *)HEXString;+ (UIColor *)colorWithWholeRed:(CGFloat)redgreen:(CGFloat)greenblue:(CGFloat)bluealpha:(CGFloat)alpha;+ (UIColor *)colorWithWholeRed:(CGFloat)redgreen:(CGFloat)greenblue:(CGFloat)blue;
/**渐变色*/
+ (UIColor*)gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withHeight:(int)height;
+ (UIColor*)gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withWidth:(int)Width;
+ (UIColor*)gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withPoint:(CGPoint)point;
@end#import "UIColor+HEX.h"
CGFloat colorComponentFrom(NSString *string, NSUInteger start, NSUInteger length) {NSString *substring = [string substringWithRange:NSMakeRange(start, length)];NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring];unsigned hexComponent;[[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent];return hexComponent / 255.0;
}@implementation UIColor (HEX)
+ (UIColor *)colorWithHex:(UInt32)hex{return [UIColor colorWithHex:hex andAlpha:1];
}
+ (UIColor *)colorWithHex:(UInt32)hex andAlpha:(CGFloat)alpha{return [UIColor colorWithRed:((hex >> 16) & 0xFF)/255.0green:((hex >> 8) & 0xFF)/255.0blue:(hex & 0xFF)/255.0alpha:alpha];
}+ (UIColor *)colorWithHexString:(NSString *)hexString {CGFloat alpha, red, blue, green;NSString *colorString = [[hexString stringByReplacingOccurrencesOfString:@"#" withString:@""] uppercaseString];switch ([colorString length]) {case 3: // #RGBalpha = 1.0f;red = colorComponentFrom(colorString, 0, 1);green = colorComponentFrom(colorString, 1, 1);blue = colorComponentFrom(colorString, 2, 1);break;case 4: // #ARGBalpha = colorComponentFrom(colorString, 0, 1);red = colorComponentFrom(colorString, 1, 1);green = colorComponentFrom(colorString, 2, 1);blue = colorComponentFrom(colorString, 3, 1);break;case 6: // #RRGGBBalpha = 1.0f;red = colorComponentFrom(colorString, 0, 2);green = colorComponentFrom(colorString, 2, 2);blue = colorComponentFrom(colorString, 4, 2);break;case 8: // #AARRGGBBalpha = colorComponentFrom(colorString, 0, 2);red = colorComponentFrom(colorString, 2, 2);green = colorComponentFrom(colorString, 4, 2);blue = colorComponentFrom(colorString, 6, 2);break;default:return nil;}return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}- (NSString *)HEXString{UIColor* color = self;if (CGColorGetNumberOfComponents(color.CGColor) < 4) {const CGFloat *components = CGColorGetComponents(color.CGColor);color = [UIColor colorWithRed:components[0]green:components[0]blue:components[0]alpha:components[1]];}if (CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) != kCGColorSpaceModelRGB) {return [NSString stringWithFormat:@"#FFFFFF"];}return [NSString stringWithFormat:@"#%02X%02X%02X", (int)((CGColorGetComponents(color.CGColor))[0]*255.0),(int)((CGColorGetComponents(color.CGColor))[1]*255.0),(int)((CGColorGetComponents(color.CGColor))[2]*255.0)];
}+ (UIColor *)colorWithWholeRed:(CGFloat)redgreen:(CGFloat)greenblue:(CGFloat)bluealpha:(CGFloat)alpha
{return [UIColor colorWithRed:red/255.fgreen:green/255.fblue:blue/255.falpha:alpha];
}+ (UIColor *)colorWithWholeRed:(CGFloat)redgreen:(CGFloat)greenblue:(CGFloat)blue
{return [self colorWithWholeRed:redgreen:greenblue:bluealpha:1.0];
}/*** @brief 渐变颜色** @param c1 开始颜色* @param c2 结束颜色* @param height 渐变高度** @return 渐变颜色*/
+ (UIColor*)gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withHeight:(int)height
{CGSize size = CGSizeMake(1, height);UIGraphicsBeginImageContextWithOptions(size, NO, 0);CGContextRef context = UIGraphicsGetCurrentContext();CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();NSArray* colors = [NSArray arrayWithObjects:(id)c1.CGColor, (id)c2.CGColor, nil];CGGradientRef gradient = CGGradientCreateWithColors(colorspace, (__bridge CFArrayRef)colors, NULL);CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(0, size.height), 0);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();CGGradientRelease(gradient);CGColorSpaceRelease(colorspace);UIGraphicsEndImageContext();return [UIColor colorWithPatternImage:image];
}
+ (UIColor*)gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withWidth:(int)Width
{CGSize size = CGSizeMake(Width, 1);UIGraphicsBeginImageContextWithOptions(size, NO, 0);CGContextRef context = UIGraphicsGetCurrentContext();CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();NSArray* colors = [NSArray arrayWithObjects:(id)c1.CGColor, (id)c2.CGColor, nil];CGGradientRef gradient = CGGradientCreateWithColors(colorspace, (__bridge CFArrayRef)colors, NULL);CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(size.width, 0), 0);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();CGGradientRelease(gradient);CGColorSpaceRelease(colorspace);UIGraphicsEndImageContext();return [UIColor colorWithPatternImage:image];
}
+ (UIColor*)gradientFromColor:(UIColor*)c1 toColor:(UIColor*)c2 withPoint:(CGPoint )point
{CGSize size = CGSizeMake(point.x, point.y);UIGraphicsBeginImageContextWithOptions(size, NO, 0);CGContextRef context = UIGraphicsGetCurrentContext();CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();NSArray* colors = [NSArray arrayWithObjects:(id)c1.CGColor, (id)c2.CGColor, nil];CGGradientRef gradient = CGGradientCreateWithColors(colorspace, (__bridge CFArrayRef)colors, NULL);CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(size.width, size.height), 0);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();CGGradientRelease(gradient);CGColorSpaceRelease(colorspace);UIGraphicsEndImageContext();return [UIColor colorWithPatternImage:image];
}
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