iOS之顏色的呼叫 顯示16進製制顏色 漸變色

十六進製制顏色 

#import ns_assume_nonnull_begin

@inte***ce uicolor (hexcolor)
+ (uicolor *)wh_colorwithhexstring:(nsstring *)color alpha:(cgfloat)alpha;
@end
ns_assume_nonnull_end
#import "uicolor+hexcolor.h"
@implementation uicolor (hexcolor)
+ (uicolor *)wh_colorwithhexstring:(nsstring *)color alpha:(cgfloat)alpha
if ([cstring hasprefix:@"0x"])
if ([cstring hasprefix:@"#"])
if ([cstring length] != 6)
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

//顯示16進製制顏色

+ (uicolor *)colorwithhexstring:(nsstring *)color alpha:(cgfloat)alpha
//如果是0x開頭的，那麼擷取字串，字串從索引為2的位置開始，一直到末尾
if ([cstring hasprefix:@"0x"])
//如果是#開頭的，那麼擷取字串，字串從索引為1的位置開始，一直到末尾
if ([cstring hasprefix:@"#"])
if ([cstring length] != 6)
// separate into r, g, b substrings
nsrange range;
range.location = 0;
range.length = 2;
//rnsstring *rstring = [cstring substringwithrange:range];
= 2;
nsstring *gstring = [cstring substringwithrange:range];
= 4;
nsstring *bstring = [cstring substringwithrange:range];
// scan values
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];
}//預設alpha值為1
+ (uicolor *)colorwithhexstring:(nsstring *)color
=

//16進製制顏色、rgb顏色、漸變色

#import @inte***ce uicolor (hex)
+ (uicolor *)colorwithhex:(uint32)hex;
+ (uicolor *)colorwithhex:(uint32)hex andalpha:(cgfloat)alpha;
+ (uicolor *)colorwithhexstring:(nsstring *)hexstring;
- (nsstring *)hexstring;
+ (uicolor *)colorwithwholered:(cgfloat)red
green:(cgfloat)green
blue:(cgfloat)blue
alpha:(cgfloat)alpha;
+ (uicolor *)colorwithwholered:(cgfloat)red
green:(cgfloat)green
blue:(cgfloat)blue;
/** 漸變色
*/+ (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) 
@implementation uicolor (hex)
+ (uicolor *)colorwithhex:(uint32)hex
+ (uicolor *)colorwithhex:(uint32)hex andalpha:(cgfloat)alpha
+ (uicolor *)colorwithhexstring:(nsstring *)hexstring 
return [uicolor colorwithred:red green:green blue:blue alpha:alpha];
}- (nsstring *)hexstring
if (cgcolorspacegetmodel(cgcolorgetcolorspace(color.cgcolor)) != kcgcolorspacemodelrgb) 
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)red
green:(cgfloat)green
blue:(cgfloat)blue
alpha:(cgfloat)alpha
+ (uicolor *)colorwithwholered:(cgfloat)red
green:(cgfloat)green
blue:(cgfloat)blue
/** *  @brief  漸變顏色
* *  @param c1     開始顏色
*  @param c2     結束顏色
*  @param height 漸變高度
* *  @return 漸變顏色
*/+ (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

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