{"id":280,"date":"2014-12-01T14:37:52","date_gmt":"2014-12-01T06:37:52","guid":{"rendered":"http:\/\/www.yusian.com\/blog\/?p=280"},"modified":"2016-07-14T22:48:55","modified_gmt":"2016-07-14T14:48:55","slug":"quartz2d%e7%9a%84%e5%9f%ba%e6%9c%ac%e4%bd%bf%e7%94%a8%ef%bc%88%e7%ac%ac%e5%9b%9b%e8%ae%b2%ef%bc%9a%e5%9b%be%e7%89%87%e8%a3%81%e5%89%aa-qq%e5%9c%86%e5%bd%a2%e5%a4%b4%e5%83%8f%e5%88%b6%e4%bd%9c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/project\/2014\/12\/01\/143752280.html","title":{"rendered":"Quartz2D\u7684\u57fa\u672c\u4f7f\u7528\uff08\u7b2c\u56db\u8bb2\uff1a\u56fe\u7247\u88c1\u526a-QQ\u5706\u5f62\u5934\u50cf\u5236\u4f5c\uff09"},"content":{"rendered":"<p><strong>\u4e00\u3001\u57fa\u672c\u601d\u8def<\/strong><\/p>\n<p>1\u3001\u5f00\u542f\u4f4d\u56fe\u4e0a\u4e0b\u6587(UIGraphicsGetCurrentContext()\u4e3a\u666e\u901a\u56fe\u5c42\u4e0a\u4e0b\u6587\uff0c\u5373view\u7684layer\u5c42)\uff0c\u4f4d\u56fe\u4e0a\u4e0b\u6587\u4f7f\u7528\u51fd\u6570UIGraphicsBeginImageContext(CGSize size)\u6216UIGraphicsBeginImageContextWithOptions(CGSize size, BOOL opaque, CGFloat scale)\u5f00\u542f\uff1b<\/p>\n<p>2\u3001\u63cf\u8ff0\u4e00\u4e2a\u539f\u56fe\u52a0\u8fb9\u6846\u5927\u5c0f\u7684\u5706\u5f62\u533a\u57df\uff1b(\u5047\u8bbe\u539f\u56fe\u4e3a\u6b63\u65b9\u5f62\uff0c\u539f\u56fe\u8fb9\u957f\u4e3a10\uff0c\u8fb9\u6846\u4e3a2\uff0c\u5219\u65b0\u533a\u57df\u8fb9\u957f\u4e3a14)<\/p>\n<p>3\u3001\u5c06\u8be5\u533a\u57df\u586b\u5145\u4e3a\u767d\u8272\u5e76\u6e32\u67d3\u4e0a\u53bb<\/p>\n<p>4\u3001\u4ee5\u539f\u56fe\u7247\u5927\u5c0f\u63cf\u8ff0\u4e00\u4e2a\u65b0\u7684\u5706\u5f62\u533a\u57df\u5e76\u8bbe\u7f6e\u5408\u9002\u7684\u5927\u5c0f\u5c3a\u5bf8\u4f7f\u5176\u5c45\u4e8e\u4e0a\u4e00\u4e2a\u767d\u8272\u5706\u5f62\u7684\u6b63\u4e2d\u5fc3<\/p>\n<p>5\u3001\u88c1\u526a\u8be5\u5706\u5f62\u533a\u57df<\/p>\n<p>6\u3001\u5c06\u539f\u56fe\u7247\u6e32\u67d3\u5230\u65b0\u7684\u5706\u5f62\u533a\u57df\uff0c\u7531\u4e8e\u4e0a\u9762\u7684\u526a\u88c1\u5173\u7cfb\uff0c\u8d85\u51fa\u5706\u5f62\u533a\u57df\u81ea\u52a8\u4e0d\u53ef\u89c1<\/p>\n<p>7\u3001\u83b7\u53d6\u4e0a\u4e0b\u6587\u6e32\u67d3\u51fa\u6765\u7684\u56fe\u7247\u8bbe\u7f6e\u67d0\u4e2aUIImageView\u4e0a\u67e5\u770b\u6548\u679c<\/p>\n<p>8\u3001\u4e3a\u65b9\u4fbf\u4f7f\u7528\uff0c\u5c06\u4e0a\u8ff0\u65b9\u9762\u5c01\u88c5\u6210UIImage\u7684Category\uff0c\u4f20\u5165\u56fe\u7247\u540d\u53ca\u8fb9\u6846\u5927\u5c0f\u5373\u53ef\u8fd4\u56de\u65b0\u7684\u5706\u5f62\u5934\u50cf\u56fe\u7247<!--more--><\/p>\n<p><strong>\u4e8c\u3001\u5173\u952e\u4ee3\u7801<\/strong><\/p>\n<pre lang=\"objc\" line=\"1\">\/\/\n\/\/? UIImage+SA.m\n\/\/? Quartz2D\n\/\/\n\/\/? Created by \u4f59\u897f\u5b89 on 14\/12\/1.\n\/\/? Copyright (c) 2014\u5e74 Sian. All rights reserved.\n\/\/\n?\n#import \"UIImage+SA.h\"\n?\n@implementation UIImage (SA)\n?\n+ (instancetype)roundCutImage:(NSString *)imageName edgeWidth:(float)width\n{\n????\/\/ 0\u3001\u65b0\u56fe\u7247\u7684\u5927\u5c0f\u4e3a\u539f\u6709\u56fe\u7247\u57fa\u672c\u4e0a\u52a0\u5916\u8fb9\u6846\u5bbd\u5ea6\n????UIImage *image = [UIImage imageNamed:imageName];\n????CGSize newSize = CGSizeMake(image.size.width + width * 2, image.size.height + width * 2);\n?????\n????\/\/ 1\u3001\u5f00\u542f\u4f4d\u56fe\u4e0a\u4e0b\u6587\n????UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);\n?????\n????\/\/ 2\u3001\u83b7\u53d6\u4f4d\u56fe\u4e0a\u4e0b\u6587\n????CGContextRef c = UIGraphicsGetCurrentContext();\n?????\n????\/\/ 3\u3001\u4ee5\u65b0\u56fe\u7247\u5927\u5c0f\u753b\u5e95\u8272\u4e3a\u767d\u8272\u7684\u5706\n????CGContextAddEllipseInRect(c, (CGRect){CGPointZero, newSize});\n????CGContextSetFillColorWithColor(c, [UIColor whiteColor].CGColor);\n????CGContextFillPath(c);\n?????\n????\/\/ 4\u3001\u5728\u56fe\u50cf\u4e0a\u4e0b\u6587\u4e2d\u63cf\u8ff0\u4e00\u4e2a\u539f\u56fe\u5927\u5c0f\u7684\u5706\n????CGRect imageRect = (CGRect){width, width, image.size};\n????CGContextAddEllipseInRect(c, imageRect);\n?????\n????\/\/ 5\u3001\u5bf9\u63cf\u8ff0\u8fdb\u884c\u88c1\u526a\uff0c\u5373\u5176\u4ed6\u533a\u57df\u4e0d\u53ef\u6e32\u67d3\n????CGContextClip(c);\n?????\n????\/\/ 6\u3001\u5c06\u539f\u56fe\u7247\u6e32\u67d3\u5230\u4e0a\u4e0b\u6587\uff08\u88ab\u88c1\u526a\u533a\u57df\u4e0d\u53ef\u89c1\uff09\n????[image drawInRect:imageRect];\n?????\n????\/\/ 7\u3001\u83b7\u53d6\u4e0a\u4e0b\u6587\u6e32\u67d3\u51fa\u6765\u7684\u56fe\u7247\n????UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();\n?????\n????\/\/ 8\u3001\u5173\u95ed\u4e0a\u4e0b\u6587\u63cf\u8ff0\n????UIGraphicsEndImageContext();\n?????\n????return newImage;\n}\n?\n@end<\/pre>\n<p><strong>\u4e09\u3001\u6548\u679c\u5c55\u793a<\/strong><\/p>\n<p>\u5de6\u56fe\uff1aself.iconView.image = [UIImage imageNamed:@&#8221;sian.png&#8221;];<br \/>\n\u53f3\u56fe\uff1aself.iconView.image = [UIImage roundCutImage:@&#8221;sian.png&#8221; 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