脚本宝典收集整理的这篇文章主要介绍了ios UIcolor扩展,脚本宝典觉得挺不错的,现在分享给大家,也给大家做个参考。
+(UIColor *) colorWIThHexString: (NSString *) hexString {
NSString *colorString = [[hexString stringByReplacingOccurrencesOfString: @"#" withString: @""] upPErcaseString];
CGFloat alpha, red, blue, green;
switch ([colorString length]) {
case 3: // #RGB
alpha = 1.0f;
red = [self colorcomponentFrom: colorString start: 0 length: 1 Case:1];
green = [self colorComponentFrom: colorString start: 1 length: 1 Case:2];
blue = [self colorComponentFrom: colorString start: 2 length: 1 Case:3];
break;
case 4: // #argB
alpha = [self colorComponentFrom: colorString start: 0 length: 1 Case:0];
red = [self colorComponentFrom: colorString start: 1 length: 1 Case:1];
green = [self colorComponentFrom: colorString start: 2 length: 1 Case:2];
blue = [self colorComponentFrom: colorString start: 3 length: 1 Case:3];
break;
case 6: // #RRGGBB
alpha = 1.0f;
red = [self colorComponentFrom: colorString start: 0 length: 2 Case:1];
green = [self colorComponentFrom: colorString start: 2 length: 2 Case:2];
blue = [self colorComponentFrom: colorString start: 4 length: 2 Case:3];
break;
case 8: // #AARRGGBB
alpha = [self colorComponentFrom: colorString start: 0 length: 2 Case:0];
red = [self colorComponentFrom: colorString start: 2 length: 2 Case:1];
green = [self colorComponentFrom: colorString start: 4 length: 2 Case:2];
blue = [self colorComponentFrom: colorString start: 6 length: 2 Case:3];
break;
default:
return nil;
break;
}
return [UIColor colorWithred: red green: green blue: blue alpha: alpha];
}
+(NSString*)stringWithColor:(UIColor *)color
{
if (color==nil) {
return @"";
}
CGFloat r,g,b,a;
[color getRed:&r green:&g blue:&b alpha:&a];
//rgba
return [NSString stringWithFormat:@"[%d,%d,%d,%f]",(int)(r*255),(int)(g*255),(int)(b*255),a];
}
+(CGFloat) colorComponentFrom: (NSString *) string start: (NSUInteger) start length: (NSUInteger) length Case:(int) ARGB{
NSString *substring = [string substringWithRange: NSMakeRange(start, length)];
NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring];
unsigned hexComponent;
[[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent];
switch (ARGB) {
case 0://alpha
return hexComponent / 255.0;
break;
case 1://red
return ( hexComponent )/ 255.0;
break;
case 2://green
return (hexComponent)/ 255.0;
break;
case 3://blue
return (hexComponent) / 255.0;
break;
default:
break;
}
return 0;
}
调用:[UIColor colorWithHexString:@"#0dc3ce"];
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