The use of some statements in iOS development

Use of 1.UISegmentedControl

Split controller is the basic use of several switches connected together

Uisegmentedcontrol *SEGMENTEDVC = [[Uisegmentedcontrol alloc] initwithitems:@[@ "spatial dynamics", @ "JIII", @ "DDA"];

Sets the background color it selects

Segmentedvc.tintcolor = [Uicolor Graycolor];

Which one is selected by default

Segmentedvc.selectedsegmentindex = 0;

Segmentedvc.frame = CGRectMake (0, 0, 320, 35);

Self.navigationItem.titleView = SEGMENTEDVC;

SELF.SEGMENTEDVC = SEGMENTEDVC;

2.switch Precautions for use

Switch (ButtonType) {

Case://Mood 0

{

If you want to define a variable in switch, be sure to add braces, let it clear the scope, from that place to where

To write multiple lines of code, you must add a brace here, because the scope of the problem

Break

}

3. Add a left and right drag effect to a view code

Add a drag gesture to Contentview

• (void) test1{

Uipangesturerecognizer *pan = [[Uipangesturerecognizer alloc] initwithtarget:self action: @selector (pan:)];

[Contenview Addgesturerecognizer:pan];

}

/**

* But this method is called when the Contentview is dragged

*/

-(void) pan: (Uipangesturerecognizer *) pan

{

Remove View drag move distance

Cgpoint point = [Pan TranslationInView:pan.view];

if (pan.state = = Uigesturerecognizerstateended | | pan.state = = uigesturerecognizerstatecancelled) {//When dragging ends or drags is interrupted, view restores The original position

Revert to the original location

Self.contenView.transform = cgaffinetransformidentity;

} else {

Point.x * 0.2 produces a good drag effect, with a good user experience

Self.contenView.transform = cgaffinetransformmaketranslation (point.x * 0.2, 0);

}

}

The use of some statements in iOS development