Perfect solution ScrollView screenshot image Blur

Uigraphicsbeginimagecontext

First explain the difference between uigraphicsbeginimagecontextwithoptions and Uigraphicsbeginimagecontext:

1:uigraphicsbeginimagecontext (cgsize size)

The size of the parameter is the newly created bitmap context. It is also the size of the graph returned by the Uigraphicsgetimagefromcurrentimagecontext function.

The function is the same as the function of uigraphicsbeginimagecontextwithoptions, quite with the uigraphicsbeginimagecontextwithoptions The opaque parameter is noand the scalefactor is 1.0.

2 uigraphicsbeginimagecontextwithoptions

The function prototypes are:

void Uigraphicsbeginimagecontextwithoptions (cgsize size, BOOL opaque, cgfloat scale);

size--with Uigraphicsbeginimagecontext

opaque-Transparent switch, if the graphic is not transparent at all, set to Yes to optimize the storage of the bitmap.

scale-– Scaling Factor

In particular, when the zoom factor is 0.0, the picture is not blurred

Screen Cutting

-(UIImage *) Capturescrollview: (Uiscrollview *) scrollview{

uiimage* image = Nil;

Uigraphicsbeginimagecontext (scrollview.contentsize); Default

Uigraphicsbeginimagecontextwithoptions (Scrollview.contentsize, NO, 0.0);

{

Cgpoint savedcontentoffset = Scrollview.contentoffset;

CGRect savedframe = scrollview.frame;

Scrollview.contentoffset = Cgpointzero;

Scrollview.frame = CGRectMake (0, 0, scrollView.contentSize.width, scrollView.contentSize.height);

[Scrollview.layer Renderincontext:uigraphicsgetcurrentcontext ()];

Image = Uigraphicsgetimagefromcurrentimagecontext ();

Scrollview.contentoffset = Savedcontentoffset;

Scrollview.frame = Savedframe;

}

Uigraphicsendimagecontext ();

if (image = nil) {

return image;

}

return nil;

}

Perfect solution ScrollView screenshot image Blur