Introduction: Uiscrollview A control that displays a large content in a small area. View different content in this small area with user smoothing and hand gestures. is the parent class of UITableView and Uitextview. It's a view, but it's special, and it can be seen as a 2-tier structure. The above is its frame layer, like the general attempt, is its visible area, the following layer is Contentview, you can slide.
Parent class UIView method
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Autoresizingmask-now basic discard, switch to AutoLayout
typedef ns_options (Nsuinteger, uiviewautoresizing) {
Uiviewautoresizingnone = 0,//No automatic adjustment
Uiviewautoresizingflexibleleftmargin = 1 << 0,//automatically adjusted to the left side of Superview, the right distance remains unchanged
Uiviewautoresizingflexiblewidth = 1 << 1, automatically adjusts the width of the control itself to ensure that the left and right distance from the Superview
Uiviewautoresizingflexiblerightmargin = 1 << 2,//automatically adjusts to the right distance from Superview, left distance remains unchanged
Uiviewautoresizingflexibletopmargin = 1 << 3,//Auto adjust with superview top distance, bottom distance remain unchanged
Uiviewautoresizingflexibleheight = 1 << 4, automatically adjusts the height of the control itself to ensure that the upper and lower distance from the Superview
Uiviewautoresizingflexiblebottommargin = 1 << 5/Auto Adjust with Superview bottom distance, top distance remain unchanged
};
Transform-deformation attribute "structure-cannot be directly assigned"
Absolute position
Cgaffinetransformmakerotation (cgfloat angle);//Rotate
Cgaffinetransformmakescale (cgfloat sx, CGFloat sy);//Zoom
Cgaffinetransformmaketranslation (cgfloat tx, cgfloat ty);/move
Incremental modifications
Cgaffinetransformrotation (Cgaffinetransform t, cgfloat angle);/rotate
Cgaffinetransformscale (Cgaffinetransform T, cgfloat SX, CGFloat sy);//Zoom
Cgaffinetransformtranslation (Cgaffinetransform t, cgfloat tx, cgfloat ty);/move
Easily confusing attributes in Uiscrollview
Contentsize Content Dimensions
Contentinset Content Border Dimensions
Contentoffset Visual Box Offset
The difference between contentsize, Contentinset and Contentoffset
Uiscrollviewdelegate Proxy method
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will be invoked when scrolling, any way triggered contentoffset changes will be invoked, the call frequency is high
-(void) Scrollviewdidscroll: (Uiscrollview *) ScrollView;
Call when Start dragging
-(void) scrollviewwillbegindragging: (Uiscrollview *) ScrollView;
Call when Stop dragging
-(void) scrollviewdidenddragging: (Uiscrollview *) ScrollView withdecelerate: (BOOL) decelarate;
Call when scrolling is about to stop (called when drag and drop starts slowing down)
-(void) scrollviewwillbegindecelerating: (Uiscrollview *) ScrollView;
Call when scrolling stops, special case: When a deceleration animation is not finished, drag again and again, Didenddecelerating will not be called
-(void) scrollviewdidenddecelerating: (Uiscrollview *) ScrollView;
Called when scaling starts
-(void) scrollviewwillbeginzooming: (Uiscrollview *) ScrollView Withview: (UIView *) view;
Called when scaling is stopped
-(void) scrollviewdidendzooming: (Uiscrollview *) ScrollView Withview: (UIView *) View Atscale: (cgfloat) scale;
Called when scaling
-(void) Scrollviewdidzoom: (Uiscrollview *) ScrollView;
Basic usage of Uiscrollview
ScrollView = [[Uiscrollview alloc] Initwithframe:cgrectmake (0, 0, 320, 460)];
Scrollview.backgroundcolor = [Uicolor Redcolor];
Whether to support sliding at the top
Scrollview.scrollstotop = NO;
Scrollview.delegate = self;
Set content size, content border, visual offset
Scrollview.contentsize = Cgsizemake (320, 460*10);
Scrollview.contentinset = Uiedgeinsetsmake (0, 50, 50, 0);
Scrollview.contentoffset = Cgpointmake (50, 50);
Whether bounce
Scrollview.bounces = NO;
Whether paging
scrollview.pagingenabled = YES;
Whether to scroll
scrollview.scrollenabled = NO;
Set scroll bar style
Scrollview.indicatorstyle = Uiscrollviewindicatorstylewhite;
Set scroll bar edges
Scrollview.scrollindicatorinsets = Uiedgeinsetsmake (0, 50, 0, 0);
Controls whether scroll bars with horizontal orientation are displayed
Scrollview.showshorizontalscrollindicator = NO;
Control whether to display scroll bars in vertical direction
Scrollview.showsverticalscrollindicator = YES;
Set the range of ScrollView scaling
Scrollview.maximumzoomscale = 2.0; Max twice times
Scrollview.minimumzoomscale = 0.5;
Whether to move at the same time, lock
scrollview.directionallockenabled = YES;
[Self.view Addsubview:scrollview];
