iOS之文本属性Attributes的使用

1.NSKernAttributeName: @10 调整字句 kerning 字句调整
2.NSFontAttributeName : [UIFont systemFontOfSize:_fontSize] 设置字体
3.NSForegroundColorAttributeName :[UIColor redColor] 设置文字颜色
4.NSParagraphStyleAttributeName : paragraph 设置段落样式
5.NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
paragraph.alignment = NSTextAlignmentCenter;
6.NSBackgroundColorAttributeName: [UIColor blackColor] 设置背景颜色
7.NSStrokeColorAttributeName设置文字描边颜色，需要和NSStrokeWidthAttributeName设置描边宽度，这样就能使文字空心.