单行及多行图文混排，聊天应用较常用，本文只提供算法。(二)
ingleLineDefaultHeight);
return kChatRoomSingleLineDefaultHeight;
}
- (CGFloat)getStringWidth:(NSString *)text size:(CGFloat)fontSize
{
CGSize size = [text sizeWithFont:kFontOfSize(fontSize) constrainedToSize:CGSizeMake(MAXFLOAT, kChatRoomSingleLineDefaultHeight)];
return size.width;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
@end
// TTMultiLineView.h
#import
#import "TTLineView.h"
@interface TTMultiLineView : TTLineView
@property (nonatomic, assign) CGFloat previousHeight;
// View's total height.
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGFloat padding;
+ (TTMultiLineView *)multiLineView:(NSArray *)views;
@end
// TTMultiLineView.m
#import "TTMultiLineView.h"
#define kChatTextHeightDefault (24.0f)
#define kChatViewWidthMax (kScreenWidth - self.padding * 2)
#define kChatSplitSingleWordWidth (15.0f)
#define kChatContentPadding (0.0f)
// Parse.
#define kChatParseTextWidthKeyName @"chat.parse.text.width"
#define kChatParseTextContentKeyName @"chat.parse.text.content"
#define kChatParseTextCutPointKeyName @"chat.parse.text.cutpoint"
@implementation TTMultiLineView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
+ (TTMultiLineView *)multiLineView:(NSArray *)views
{
TTMultiLineView *mlv = [[TTMultiLineView alloc] initWithFrame:CGRectZero];
[mlv chatMultiLineView:views];
return mlv;
}
- (CGFloat)chatMultiLineView:(NSArray *)array
{
CGFloat viewWidth = 0.0f;
CGFloat viewHeightMax = 0.0f;
if (self.padding == 0.0f)
{
self.padding = kChatContentPadding;
}
for (NSDictionary *dict in array)
{
switch ([self contentType:dict])
{
case kChatRoomText:
{
NSString *contentText = [self chatContentText:dict];
CGFloat fontSize = [self chatContentTextFont:dict];
if (contentText != nil && contentText.length > 0)
{
CGSize firstCharSize = [[contentText substringToIndex:1] sizeWithFont:kFontOfSize(fontSize) constrainedToSize:CGSizeMake(MAXFLOAT, kChatTextHeightDefault)];
if (viewWidth + firstCharSize.width > kChatViewWidthMax)
{
// insert new line if last string reach end.
self.previousHeight += kChatTextHeightDefault;
viewWidth = 0.0f;
}
}
NSArray *sectionStrs = [self splitString:contentText start:viewWidth size:fontSize];
// Multiline.
NSUInteger line = 0;
for (NSDictionary *d in sectionStrs)
{
NSUInteger width = [[d valueForKey:kChatParseTextWidthKeyName] unsignedIntegerValue];
NSString *text = [d valueForKey:kChatParseTextContentKeyName];
ChatRoomFontColorMode colorMode = [[dict valueForKey:kChatTextColorTypeKeyName] integerValue];
UIColor *color = [self chatTextColor:colorMode];
if (line != 0)
{
viewWidth = 0.0f;
if (line == 1)
{
// First Line
self.previousHeight += MAX(kChatTextHeightDefault, viewHeightMax);
viewHeightMax = kChatTextHeightDefault;
}
else
{
// > 1 line.
self.previousHeight += kChatTextHeightDefault;
}
}
else
{
viewHeightMax = MAX(viewHeightMax, kChatText
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