例如:
I set UIView s alpha property as alpha = 0, 这是否意味着其<代码>opaque 财产应视为opaque=YES?
How opaque ,alpha/code> and backgroundColor 影响业绩?
......
nil,为tView提供了明确的背景说明。 给您的<条码>查询表提供背景资料,指定一个<条码>查询编码<>。
myView.backgroundColor = [UIColor greenColor];
也可将<条码>背井喷射/密码>作为图像:
myView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed@"myImage"]];
<代码>alpha>/code>是观点不透明。 您可使用这一称谓来打上
<代码>opaque是一个显示
myView.opaque = NO;
页: 1 解释为什么和如何使用<代码>opaque 财产:
This property provides a hint to the drawing system as to how it should treat the view. If set to YES, the drawing system treats the view as fully opaque, which allows the drawing system to optimize some drawing operations and improve performance. If set to NO, the drawing system composites the view normally with other content. The default value of this property is YES.
An opaque view is expected to fill its bounds with entirely opaque content—that is, the content should have an alpha value of 1.0. If the view is opaque and either does not fill its bounds or contains wholly or partially transparent content, the results are unpredictable. You should always set the value of this property to NO if the view is fully or partially transparent.
<>光>
not transparent
<>中>透明度:
见通过,而不是不透明。
http://www.hchr.org。
The inventors of RGBA model listed alpha after the Greece letter in the normar interpolation program αA + (1-α)B
To understand we can assume alpha is synonym for opaque in this graphic and image context.
<>Restrong>Relation between opaque,transparency and alpha:
opaque is directly propotional to alpha and inversely propotional to transparency i.e increase in alpha value results in increase in opaque and and decrease transparency
如果一种观点认为甲型六氯环己烷为1.0,那么它就完全不透明。
如果认为甲型六氯环己烷为0.0,那就完全透明。
rel between opaque,alpha and backgroundcolor:
he alpha will also affect the alpha of the backround color i.e. if the background color is 0.5 transparent and the alpha is also 0.5, this has the effect of making the background view s alpha 0.25 (0.5 * 0.5)
<>亮度>Opaque perfomance:
如果u set opaque as YES,那么,由于混杂不成 view子,或以直观或肤色出现,业绩就会增加。
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