How to show a star rating on iphone

http://blog.csdn.net/fanjunxi1990/article/details/8663914

As a result of the project needs, a list of items, which has a rating of each item, is the star rating of all apps in the App Store

Here's DisplayStarView.h.

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2. //
4. DisplayStarView.h
6. Testexpress
8. //
10. Created by Juncy_fan on 13-3-12.
12. Copyright (c) 2013 Juncy_fan. All rights reserved.
14. //
18. #import <Foundation/Foundation.h>
22. @Interface Displaystarview:uiview
24. {
26. CGFloat _starsize; / * Determine the size of the star according to the font size * /
28. Nsinteger _maxstar; / * Total length * /
30. Nsinteger _showstar; //need to show the length of the star
32. Uicolor *_emptycolor; //color when not lit
34. Uicolor *_fullcolor; //Light up the colors of the stars
36. }
38. @property (nonatomic, assign) CGFloat starsize;
40. @property (nonatomic, assign) Nsinteger Maxstar;
42. @property (nonatomic, assign) Nsinteger Showstar;
44. @property (nonatomic, retain) Uicolor *emptycolor;
46. @property (nonatomic, retain) Uicolor *fullcolor;
48. @end

DISPLAYSTARVIEW.M as follows

[CSharp]View Plaincopy

2. //
4. displaystarview.m
6. Testexpress
8. //
10. Created by Juncy_fan on 13-3-12.
12. Copyright (c) 2013 Juncy_fan. All rights reserved.
14. //
18. #import "DisplayStarView.h"
22. @implementation Displaystarview
24. @synthesize starsize = _starsize;
26. @synthesize Maxstar = _maxstar;
28. @synthesize Showstar = _showstar;
30. @synthesize emptycolor = _emptycolor;
32. @synthesize fullcolor = _fullcolor;
36. -(ID) initWithFrame: (CGRect) frame
38. {
40. self = [super Initwithframe:frame];
42. if (self)
44. {
46. Self.backgroundcolor = [Uicolor Clearcolor];
48. //The size of the default star is 13.0f
50. Self.starsize = 13.0f;
52. //The color is gray when not lit
54. Self.emptycolor = [Uicolor colorwithred:167.0f/255.0f green:167.0f/255.0f blue:167.0f/255.0f alpha:1.0f];
56. //The color is bright yellow when lit
58. Self.fullcolor = [Uicolor colorwithred:255.0f/255.0f green:121.0f/255.0f blue:22.0f/255.0f alpha:1.0f];
60. //The default length is set to
62. Self.maxstar = 100;
64. }
68. return self;
70. }
74. Redraw a View
76. -(void) DrawRect: (cgrect) Rect
78. {
80. //Drawing code
82. Cgcontextref context = Uigraphicsgetcurrentcontext ();
86. nsstring* stars = @"★★★★★";
90. rect = self.bounds;
92. Uifont *font = [Uifont boldsystemfontofsize:_starsize];
94. Cgsize starsize = [stars Sizewithfont:font];
96. Rect.size=starsize;
98. [_emptycolor set];
100. [stars Drawinrect:rect Withfont:font];
104. CGRect clip = rect;
106. Clip.size.width = Clip.size.width * _showstar/_maxstar;
108. Cgcontextcliptorect (Context,clip);
110. [_fullcolor set];
112. [stars Drawinrect:rect Withfont:font];
114. }
118. -(void) Dealloc
120. {
122. [_emptycolor release];
124. [_fullcolor release];
128. [Super Dealloc];
130. }
134. @end

How do I need to use it? It's simple, the value needs to know what the score is OK, like

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2. The review is 4.2 minutes.
4. Displaystarview *SV = [[Displaystarview alloc]initwithframe:cgrectmake (90, 90, 200, 40)];
6. [Self.view ADDSUBVIEW:SV];
8. Sv.showstar = 4.2*20;
10. [SV release];
14. //Reviews are 2.5 points
16. Displaystarview *SV1 = [[Displaystarview alloc]initwithframe:cgrectmake (90, 90+40, 200, 40)];
18. [Self.view ADDSUBVIEW:SV1];
20. Sv1.showstar = 2.5 * 20;
22. [SV1 release];
26. //Reviews are 4.8 points
28. Displaystarview *sv2 = [[Displaystarview alloc]initwithframe:cgrectmake (90, 90+40+40, 200, 40)];
30. [Self.view Addsubview:sv2];
32. Sv2.showstar = 4.8 * 20;
34. [Sv2 release];

Operation Result:

How to show a star rating on iphone