IOS Knowledge points

1. Use the command "-fno-objc-arc" to set an. m file in the ARC project separately to MRC encoding compilation

Step: ProjectName, Target, Build phases, complier flags,

2, prohibit the tableview of the header of the suspension, add the following code can be

Disable cell header suspension

-(void) Scrollviewdidscroll: (Uiscrollview *) ScrollView {

cgfloat sectionheaderheight = ;

if (ScrollView. Contentoffset. Y<=sectionheaderheight&&scrollview. Contentoffset. y>=0) {

ScrollView. Contentinset = uiedgeinsetsmake (-scrollview. Contentoffset. y, 0, 0, 0);

} Else if (scrollView. Contentoffset. y>=sectionheaderheight) {

ScrollView. Contentinset = uiedgeinsetsmake (-sectionheaderheight, 0, 0, 0);

}

}

3. Print Font Library

Print Font Library

For (nsstring *familyname in [uifont Familynames]) {

NSLog(@ "Font familyname =%@", familyname); //* Output font family section name

For (nsstring *fontname in [uifont Fontnamesforfamilyname:familyname]) {

NSLog (@ "\t%@", FontName); //* Output font family section under Word name

}

}

4, solve the TableView cell does not welt, in the Cellforrowatindexpath agent method to add

Tableviewcell No Welt solution 2

if ([cell respondstoselector:@selector (setseparatorinset:)]) {

[Cell Setseparatorinset:uiedgeinsetszero];

}

IOS Knowledge points